Royal arms (Final Fantasy XV)



The royal arms are special weapons in Final Fantasy XV Universe that only Noctis Lucis Caelum and others of his bloodline can brandish. They are the weapons of the previous monarchs of Lucis. There have been 113 kings, but there are thirteen known royal arms. The power of kings is to wield all of their collected royal arms simultaneously, an ability known as Armiger. In Kingsglaive: Final Fantasy XV, the statues of the Old Wall wield giant versions of the royal arms. The weapons can be equipped and used in battle in Final Fantasy XV where some are obtained as part of the story and some are found in optional dungeons.

Profile
The weapons contain the power of light, are mostly the color of platinum yet often with elaborate decorations, and have wing motifs upon them. As they contain the power of light, they are especially good for fighting daemons. According to legend, a king of Lucis once fought the powers of darkness with weapons of light on his side and eradicated Starscourge from the world. The event is described in Cosmogony as:

Due to this, the ability to conjure a "collection of glaives" is thus implied to be an ability granted to the kings by the gods. Unlike the powers of the Oracle—whose powers were granted by Bahamut—no specific Astral is connected to the gifting of the royal arms to the Lucian line.

The weapons have been preserved for future generations by the monarchs who wielded them, although the exact process this entails is unknown. They are usually left in royal tombs that are hidden around the nation of Lucis in hard-to-reach locations, such as caves, forests, and even on a volcano. Arms left in tombs have been known to have been broken into and stolen and thus thought lost, such as the Tomb of the Tall in Duscae. Royal arms need not be entombed to be useful to the heirs, as is seen with the Trident of the Oracle and the Sword of the Father; it is only necessary for the heir to come into contact with the weapon and pick it up. Only those of the Lucis Caelum bloodline can actually use the arms as weapons, although others can still handle them.

When a royal arm recognizes its rightful wielder, it will become transparent and crystalline and glows before entering the king's body in a flash of light leaving soul crystals glimmering in the air, signifying the bonding of the souls of the Lucian kings that is what allows the heirs to wield the sacred glaives. From then on the wielder can forge the weapon from thin air, and it will appear into their grasp at will no matter where they are. They can even call upon all of the royal arms they have thus collected and momentarily wield them simultaneously, gaining the power to levitate. This state is called Armiger and it cannot usually be sustained for long. Even when not in Armiger, the king can use royal arms to warp like with a normal weapon.

The weapons have a transcendental presence, as they can be wielded by more than one person at once, essentially being in more than one location simultaneously. For example, Noctis and Ardyn Izunia can both wield Armiger at the same time with the exact same set of royal arms, and Noctis can use the Sword of the Father in the battle against Leviathan even if it is in Ravus Nox Fleuret's possession. Even after being collected from a royal tomb, it is implied the next heir can still return to the same tomb for the weapon as well, as Cor Leonis, who once accompanied Prince Regis on his travels across Lucis, directs Noctis to his first royal tomb and hands him the key, implying he has been on this task before.

The arms seem to always be proportionate to their wielder, as when the statues of the Old Wall use their royal arms the weapons are gargantuan in size. The arms' transcendental presence may thus hint at their link to astrals, who can similarly appear and disappear from the world at will and exist in more than one body in one time.

The power of kings is also to lend their power to those they are bonded to. Usually only those of the Lucis Caelum bloodline can brandish the royal arms, but with the king's blessing those joining in an attack with him can also momentarily wield them, as seen in Armiger Chain in Final Fantasy XV. Further proof of this is Ravus being unable to wield the Sword of the Father at first, but after solidifying his loyalty to Noctis, he wields it as a weapon to fend off the daemons Emperor Aldercapt ushers upon him. If the power to wield crystalline weapons of light does originate from Bahamut, the king's ability to share it with others may be further continuation of this theme.

Ardyn Izunia has the same thirteen royal arms Noctis has and wields them in Armiger during his final confrontation with Noctis. He and his royal arms glow red as opposed to Noctis's blue. King Regis meanwhile is seen employing Armiger in Brotherhood Final Fantasy XV and Kingsglaive: Final Fantasy XV.

Story
The Lucis Caelum bloodline was chosen by the gods of Eos, the Astrals, to save the world from the malady known as Starscourge which transforms humans and animals alike into monsters of the dark known as daemons. Daemons in turn shed substance from their bodies that consumes sunlight, lengthening the nights. There exists a prophecy of the coming of the True King who would be chosen by the Crystal when the world would be covered in darkness. The Crystal is a stone that exudes the power of light the kings of Lucis are sworn to protect until the time of the prophecy, and command its power with the Ring of the Lucii said to have been given to the kings by the gods alongside the Crystal. The kings can forge weapons out of thin air and combine their powers across generations via the bonding of the souls and the Ring of the Lucii. Even without the ring the heirs to this bloodline can wield the royal arms, magical weapons that bear the power of light that no one else can brandish.

King Regis is implied to have embarked on a journey across Lucis to collect royal arms, as he can wield a collection of glaives in Armiger, although he rarely does so after being weakened for upholding the Wall around the Crown City of Insomnia. His personal arm is the Sword of the Father.

After the Empire of Niflheim invades Insomnia and steals its Crystal and King Regis is killed, his son Prince Noctis embarks on a journey to collect the weapons of his forebears and forge covenants with the Astrals to gain the power he needs to reclaim his throne. He is put on this path by Cor Leonis, the marshal of the Crownsguard who once accompanied Regis on his travels across Lucis. Cor gives Noctis a key to the royal tombs and shows him the tomb where Noctis inherits the Sword of the Wise. Cor enlists the Hunters to comb the land in search of the lost tombs.

Noctis travels Lucis and uncovers many royal tombs and collects their weapons, building his collection of royal arms and gaining the power of Armiger, which grows stronger with every new weapon he finds. When he and his friends are accosted by Ravus Nox Fleuret, the high commander of Niflheim's magitek infantry, Noctis shows off his newfound powers by entering Armiger, but Ravus remains unphased. Ravus holds the Sword of the Father, the sword of the late King Regis, although it is reported he cannot wield it. Ravus had salvaged it from Regis's body after he had been killed.

Noctis continues his quest to Altissia where he is to rendezvous with his fiancee Lunafreya Nox Fleuret. The Nox Fleurets are Oracles whom the Astrals granted powers to heal those afflicted with Starscourge and the ability to commune with gods thousands of years ago, the same time the kings of Lucis gained their powers and the Crystal. Luna believes Noctis is the Chosen King and that her mission is to guide him to fulfill the prophecy. Ravus is Luna's brother who begrudges Regis and doubts Noctis has what it takes to become the True King.

Luna uses the Trident of the Oracle, the Oracles' traditional weapon that is also a royal arm, to beckon the sea goddess Leviathan. Leviathan goes on a rampage around Altissia and Luna uses the trident to call upon the spirits of the old kings to empower Noctis, who enters a sustained Armiger and subdues Leviathan with the power of kings, forging a covenant with her. Noctis obtains the Ring of the Lucii from Luna who had been safeguarding it for him, but she is killed. Her body disappears into the Astral Realm and the Trident of the Oracle goes missing.

Noctis continues on his quest and with instructions from Cor finds another royal tomb in Fodina Caestino, collecting the Katana of the Warrior. He is met by the Astral goddess Shiva on his way to the imperial capital who brings him the Trident of the Oracle as she forges a covenant with him. In the capital of Gralea Noctis finds he cannot conjure weapons to his grasp as his powers have been sealed by imperial technology, the Wallbreaker Wave. He continues with the Ring of the Lucii as his only weapon and comes across Ravus's body in Zegnautus Keep, the imperial magitek laboratory. Noctis finds the Sword of the Father by Ravus's body, and gains his final royal arm, also learning Ravus had come around to believe Noctis is the True King and had intended to bequeath the sword to him. Ravus had been killed by Ardyn, who had cut him down with his own Sword of the Father, a royal arm he already had.

Now wielding the full powers of Armiger, Noctis finds the Crystal in Zegnautus Keep where the empire had brought it, unable to use it as they had never found the Ring of the Lucii. When he approaches the Crystal however, he is pulled inside and disappears from the world for ten years. The sun never rises again and Eos is overtaken by daemons.

Noctis returns ten years later having gained the power of the Crystal, ready to fulfill the prophecy as the True King. Noctis fells Ardyn outside the Citadel, his immortal ancestor from two thousand years ago who was once on a path to be chosen by the Crystal. Ardyn's soul had been corrupted by daemons after he had worked as a healer and he had been cast aside, the Crystal choosing another in his stead. Ardyn had continued a shadowy existence for millennia, unable to die, waiting for the coming of the True King. Ardyn summons the same royal arms Noctis wields to him and the two duel both wielding the power of kings, but Noctis emerges victorious and kills Ardyn.

Noctis ascends the throne and wedges the Sword of the Father into the floor in front of him. He summons the spirits of the past kings to him with the Ring of the Lucii and their arms appear around the throne. Each spirit of a king assaults him one by one with their royal arms until Noctis is killed by Regis wielding the Sword of the Father. His soul enters the afterlife where he confronts Ardyn's soul. The royal arms the kings' spirits had plunged into his body to kill him emerge from Noctis, and the kings take up arms once again to combine their powers to erase Ardyn's soul, Noctis dealing the final blow with the Sword of the Father. The prophecy fulfilled, Noctis disperses into light, the Ring of the Lucii disintegrates, daemons disappear and the sun rises upon the world of Eos.

What happens to the royal arms after Noctis's sacrifice is unknown, as the Lucis Caelum bloodline has been extinguished.

Gameplay
Royal arms can be equipped by Noctis. Each has a high attack power, but using them as normal weapons drains Noctis's health when he attacks with them. This is referenced in the game when Prompto asks Noctis if using the royal arms wears him out. They are generally especially good against daemons. If Noctis's HP is below the amount of HP a certain royal arm requires, he will enter Danger state. The player does not need to use the royal arm to benefit from its status boost; just equipping them will drastically boost Noctis's stats. Royal arms do not trigger link-strikes.

Most of the arms are discovered from royal tombs. Some are obtained as part of the story, and some are optional.

The arms are wielded at once during Armiger, during which Noctis doesn't lose health from using them. During his battles against Titan and Leviathan, Noctis uses royal arms to parry their attacks, and won't expend HP. Learning Armiger Chain in the Ascension lets Noctis's party members join in a group attack where they momentarily wield the royal arms as well.

The last stage of the Armiger Chain is:
 * First attack:
 * Sword of the Wise - Prompto
 * Axe of the Conqueror - Gladiolus
 * Sword of the Wanderer - Ignis
 * Blade of the Mystic - Noctis


 * Second attack:
 * Star of the Rogue - Prompto
 * Sword of the Tall - Gladiolus
 * Mace of the Fierce - Ignis
 * Bow of the Clever - Noctis


 * Third attack:
 * Scepter of the Pious - Prompto
 * Shield of the Just - Gladiolus
 * Katana of the Warrior - Ignis
 * Trident of the Oracle - Noctis


 * Final attack:
 * Sword of the Father - Noctis

During a fight against the Adamantoise, if Noctis counters an attack from its head, he will summon a royal arm for his party members as well as himself: the Sword of the Mystic for himself, the Axe of the Conqueror for Gladiolus, the Sword of the Wise for Prompto, and the Swords of the Wanderer for Ignis, enabling them to warp on top of its head to deliver a devastating counter. This suggests the royal arms can be used by non-Lucian kings, provided a Lucian king gives them permission and enabling them to warp.

Every royal arm has a unique moveset. Collecting all arms earns the Faithful Heir achievement/trophy. Royal arms carry over when using chapter select.

Sword of the Wise
Sword of the Wise is the first royal arm Noctis obtains. He acquires it in Chapter 2 from the Tomb of the Wise located above ground in northern Leide. The sword performs preemptive warp-strikes to close the distance between Noctis and the enemy quickly. A simple sword that belonged to the Lucian king known as the Wise who raised the first Wall of Lucis, this sword reflects his simplicity and the frugality applied in his rule.

The basic combo starter is very powerful, has long reach and is fast. It looks like a warp-strike. Reverse directional input has Noctis backflip away from the enemy and begin an aerial combo that opens with a warp, followed by a weak slash. As the aerial combo attack is a ranged attack but does not consume MP, it is essentially a free close-range warp-strike. The warp opener is similar to its ground counterpart but does better damage point-blank. Sword of the Wise's phase-counter is a normal slash. Its warp-strike is a normal warp-strike with a followup slash. The second hit does more damage than a regular attack, and the player is invincible during the whole animation.

The player can exploit the powerful ground opener and use the manual dodge roll to avoid using the phase-counter. Sword of the Wise is a good hit-and-run weapon.

One of the statues of the Old Wall in Insomnia wields a giant version of the sword in Kingsglaive: Final Fantasy XV.

Axe of the Conqueror
The Axe of the Conqueror is gained in Chapter 2 from the Tomb of the Conqueror found underground at the end of Keycatrich Trench dungeon in northern Leide. A large labrys/doublebladed halberd that once belonged to the Lucian king known as the Conqueror, a king that rose in times of chaos to unite the Lucian continent.

The axe is a polearm for gameplay purposes that performs slow but powerful attacks at the expense of defense. It is especially good at putting enemies in Vulnerable state. Its basic combo is four slow axe strikes. Forward directional input has Noctis jump forward and do an aerial attack: a descending axe swing. This way the player can airstep without using MP. Its phase-counter is a slow uppercut swing.

Warp-striking with the axe has Noctis throw it above the enemy, warp to it and deal an overhead strike. This drains an unusually large amount of health.

Bow of the Clever
Bow of the Clever is an optional royal arm found in the depths of Balouve Mines in southern Leide. After felling the dungeon boss, the player can find a crack in a wall that leads to a the Tomb of the Clever. A weapon that once belonged to the Lucian king known as the Clever, who excelled and sought skills and refinement through the arts.

Bow of the Clever is a crossbow that fires piercing arrows while allowing the wielder to move freely about the battlefield. Like most ranged weapons, the Bow of the Clever uses Noctis's Magic stat in damage calculations. Its basic combo is to shoot and it doesn't require reloading. Bolts travel through enemies and can hit multiple foes. It deals more damage the closer Noctis is to his target.

Directional input during fire has Noctis quickstep in that direction, similar to using daggers. Noctis is invincible during a quickstep. Releasing the directional input and inputting it again during the dodge performs an MP-free airstep. Noctis will jump and begin an aerial combo where he will shoot once. Bow of the Clever's phase-counter is a shoot.

Warp-striking with the crossbow warps near to the enemy and shoots it four times point-blank. Noctis will not strike initially, but will set up for a barrage of bolts. It aims high however and will likely miss unless the enemy is large.

The crossbow allows good mobility to kite enemies and works best when Noctis is equipped for high Magic. Its ability to hit multiple enemies at once is good for multi-encounters, but each enemy struck will also drain Noctis's health. Combining it with Ignis's Overwhelm Technique gives the crossbow an amazing fire-rate and damage, but the player is in danger of entering Danger state as it is easy to drain all of Noctis's health this way.

Swords of the Wanderer
Swords of the Wanderer is the third royal arm obtained during the main story, found in a dungeon in Chapter 3. They are a set of dual swords that can transform into a single weapon to deliver powerful attacks, and belonged to the free-spirited Lucian king known as the Wanderer, who pioneered to lands untouched by man.

Its basic combo starts and ends with a powerful strike with the swords combined. The body of the combo is identical to that of normal daggers. Forward directional input skips to the combo finisher, which can be used to stagger enemies or break off appendages. Any other directional input has Noctis jump in that direction to begin an aerial combo that is three fast slashes. This airstep doesn't consume MP. Its phase-counter is a slash with both swords. Warp-striking with the swords has Noctis warp to the enemy, slash with both swords, and combine them for a final slash. He is invincible to damage during this.

The Swords of the Wanderer have high damage output, surpassing even the Zwill Crossblades (unless the player is at full HP or the enemy is weak to daggers), while having the same basic combo and more range.

Blade of the Mystic
Blade of the Mystic is the fourth royal arm obtained during the main quest. It is found at the Disc of Cauthess in Chapter 4. It is a longsword that boosts the wielder's Strength through a unique self-buff. It was once the property of the Mystic, the first Lucian king who rose to protect the Oracle.

Its basic combo has Noctis perform myriad slashes and stabs at medium speed and area of effect. When the player stops attacking, Noctis will hold the sword in front of him and gain +100 Strength for 10 seconds. This buff can be activated outside of combat. Blade of the Mystic's aerial attack is a single slash, and its phase-counter is an uppercut slash.

Warp-striking with the Blade of the Mystic has Noctis shoot Armiger projections before delivering the strike, a strong direct downwards slash. Each projection does the same damage as the blade would in a melee hit adjusted for warp-strike distance bonus. Due to the focused nature of the physical strike, it is good for breaking normally hard-to-reach appendages.

Noctis displays a preference for this weapon after obtaining it, as he uses it the most whenever he executes an attack that requires a royal arm. The blade is well balanced and a recommended addition to any arsenal.

Based on its description, it seems this blade belonged to the Founder King.

One of the statues of the Old Wall in Insomnia wields a giant version of the longsword in Kingsglaive: Final Fantasy XV.

Star of the Rogue
Star of the Rogue is an optional royal arm found at the end Myrlwood in north-west Cleigne. It is a shuriken that can deal multiple hits in rapid succession, either on different targets or on the various body parts of a single large enemy, and can split up into many duplicates. The weapon reflects the stealth ninja-like martial arts of the Rogue, the Lucian queen who spurned the public eye and took to the shadows to enact her rule.

When Noctis throws the star it goes through enemies and flies in erratic arcs. Unlike most ranged weapons, the Star of the Rogue uses Noctis's Strength stat to calculate damage. It deals more damage the closer the enemy is. Directional input during the attack has Noctis jump in the direction to begin an aerial combo where he throws the star while airborne. Its phase-counter is a melee attack.

Warp-striking has Noctis warp to the enemy and grind it with the shuriken. It hits multiple times and does a lot of damage to both Noctis and the enemy. It is good for breaking off appendages. The warp-strike can miss.

The Star of the Rogue is a good ranged weapon for Strength-based builds.

The Star was available in Platinum Demo – Final Fantasy XV as a secret weapon. One of the statues of the Old Wall in Insomnia wields a giant version of the star in Kingsglaive: Final Fantasy XV.

Sword of the Tall
Sword of the Tall is the toughest royal arm to obtain, and many players leave it for Chapter 15. The sword is not at the Tomb of the Tall in south-eastern Duscae, but in the optional Costlemark Tower dungeon north-east of the tomb that is open during the night. The boss at the bottom of the dungeon drops the sword. It is a chainsaw-like greatsword made for the Lucian king known as the Tall, whose most defining trait was his colossal physique.

Sword of the Tall is a greatsword that deals multiple hits with each blow. Its basic combo is to perform slow grinding slashes that hit multiple times, like a chainsaw. Its aerial combo is a single grinding slash, and its phase-counter is a stab. Warp-striking with it has Noctis warp to the enemy and spin the sword, hitting enemies around him multiple times. The multi-hit nature of this sword makes it good at breaking off enemy appendages.

Though it is the most powerful royal arm, it comes with steep Spirit and elemental defense penalties. It is best for defensive players with a physical offensive who focus on reinforcing Noctis's already weak defense.

The sword is known as the "Largesword of the Dynast King" in Japanese. Dynast King is a title in the world of Ivalice.

Shield of the Just
Shield of the Just is found in Tomb of the Just, west of the Disc of Cauthess and south from Lestallum in Thommel's Glade. It is an optional royal arm, but the player does not need to do a dungeon to acquire it. It is an enormous shield that once belonged to the Lucian queen known as the Just, celebrated for her efforts and serenity to establish everlasting peace in her rule.

Shield of the Just handles almost exactly like a regular shield. Its warp-strike has a large area of effect, allowing the player to clear crowds of enemies and making it useful for warp-strike AP farming. Its basic combo is to bash the enemy with the shield, and it can be used in aerial combos. Noctis performs a different shield bash as a phase-counter. It has a higher than normal capacity to force enemies into the Vulnerable state.

Holding the defense button enters a defensive stance similar to cover status where Noctis cannot move and continually consumes MP, with the same bonus HP regeneration as with a regular shield. Unlike regular shields, the Shield of the Just reduces normally unblockable attacks by about 75% in this stance. Given its strength and use of MP, the Shield of the Just may be most useful as a healing tool, but the player can use it to block attacks they struggle dodging. It can be menu-swapped to bypass the Strength penalty.

Mace of the Fierce
Mace of the Fierce is an optional royal arm found at the Rock of Ravatogh volcano. It is a mace that can easily break off enemy appendages. It once belonged to the Lucian king known as the Fierce, a king famous for his love of his people and infamous for his brutality against his opponents.

Its basic combo is the slowest of all weapons. Its aerial attack is a single bash and its phase-counter is an uppercut bash. When Noctis warp-strikes with it he follows the strike with a single bash, winding up to slam the mace down on the opponent. It has a long range and can hit targets that move away in spite of the slow start-up. Noctis is invincible during the warp-strike.

Though it is great for defeating giant monsters and daemons, it is advised to switch out the mace in the face of imperial forces due to its -50% Ballistics Resistance penalty. Those that enjoy a pure physical build for Noctis, or bear high defense against Ballistics, may choose use this at their leisure.

One of the statues of the Old Wall in Insomnia wields a giant version of the mace to destroy buildings in Kingsglaive: Final Fantasy XV.

Scepter of the Pious
The player will get a quest to visit Malmalam Thicket during the main quest in Chapter 6, but it is not necessary to follow it. The player can also visit the royal tomb at any other time to retrieve it, but if they go when prompted Iris Amicitia will accompany the party as a guest. The scepter is found at the end of the thicket in the Tomb of the Pious. The weapon is said to have belonged to the Lucian king known as the Pious, who ruled by practically applying divine principles, and worked closely with the Oracle of his era.

Scepter of the Pious takes different forms to perform a variety of attacks. As a jack of all trades weapon, it uses movesets from other royal arms and uses Noctis's Magic stat in its damage calculations. It allows for a varied moveset with only one equipment slot, although the scepter itself should not be viewed as a mere multiweapon.

When attacking with it, the Scepter of Pious starts with the same combo starter Trident of the Oracle uses. The main part of the combo is from Sword of the Wise, and the combo finisher is from Axe of the Conqueror. Using forward directional input changes the main body of the combo to that of Sword of the Tall. Using side directional input changes the main body of the combo to that of Blade of the Mystic. Using reverse directional input during a combo changes its main body to that of the Trident of the Oracle. Releasing the stick and then tilting it in various directions begins an aerial combo to that direction with Noctis jumping. The aerial attack and phase-counter use the movesets from Axe of the Conqueror. The player can interrupt most of the combos by performing the input for other combos.

Warp-striking with the scepter has Noctis launch it into the air, then slam down for high damage similar to how Aranea Highwind fights. This move is the Trident of the Oracle's warp-strike with the follow-up from the Axe of the Conqueror's warp-strike.

In Armiger the scepter takes on the form of other royal arms for its combo attacks. Each directional input summons a different royal arm: forwards summons the Sword of the Tall, reverse summons the Trident of the Oracle (including its trait of leaving behind holograms), and sideways summons the Blade of the Mystic. No input summons the Sword of the Father. Aerial attacks and finishers are replaced with the Axe of the Conqueror's moveset.

Due to its reliance on the Magic stat, and its innate high Magic and Darkness Defense stats, the scepter is best for a magic-centered or weapon-heavy fighting style. It is good for fending off daemons, and when used with the Royal Raiment attire (without the jacket it gives +30% bonus to Magic).

Trident of the Oracle
Trident of the Oracle is the traditional weapon of the Oracles' bloodline. It is considered a polearm for gameplay purposes. The trident is a prominent royal arm in the story, second only to the Sword of the Father, King Regis's sword. It is wielded by Lunafreya when she calls forth Leviathan in Altissia. Although Luna is not of the Lucis Caelum bloodline, she can still use the trident to empower Noctis for his battle against the sea goddess. Noctis does not obtain the trident from a royal tomb, rather, it is obtained as part of the story at the end of Chapter 12. Like its name implies, it is the weapon of the Oracle, the intermediaries of the Astral gods of Eos and the healer of the dreaded ailment known as the Starscourge.

When the player attacks with the trident, it will leave a hologram that stays for a few seconds and will repeatedly damage enemies that touch it. The Scepter of the Pious also gets this trait when it assumes the form of the trident. The holograms stack and thus do high damage to stationary targets.

The Trident of the Oracle's basic combo is to stab the enemy. With forward directional input it skips to the powerful combo finisher. Any other directional input has Noctis jump in that direction and begin an aerial combo that consists of two stabs. The second aerial combo is a descending plunging attack that has a high break modifier. Its phase-counter is a jumping stab.

Warp-striking with the trident has Noctis warp above the enemy and attack it from above with a plunging attack, similar to the fighting style of Aranea Highwind. The warp strike is good for dodging and attacking.

Trident of the Oracle is good at dealing damage fast.

Luna is not the only Oracle to have wielded the trident. One of the statues of the Old Wall in Insomnia wields a giant version of the trident in Kingsglaive: Final Fantasy XV.

Katana of the Warrior
Katana of the Warrior is obtained at the end of Chapter 10, in the abandoned quarry of Fodina Caestino. Found in the easternmost lands of Cartanica of Tenebrae, this sword once belonged to Lucian king known as the Warrior. Katana of the Warrior is believed to have been made in lands far from Lucis.

Katana of the Warrior is a longsword that attacks quickly and relentlessly both on the ground and in the air. Its phase-counter is to hit with the hilt. Warp-striking with it has Noctis perform a long wind-up that culminates in a strong slash all the while being immune to damage. By holding or mashing the warp button, the player can rapidly execute followup warp-strikes that are performed instantly, dealing massive burst damage. Since they are individual warp-strikes, the player remains immune throughout the combo, but this will use up Noctis's HP and MP in seconds. The player can use the katana's unique warp-strike for burst damage when overwhelmed to destroy the enemies while being immune.

Though the katana proves useful against monsters and imperial forces, it is a double edged sword against daemons due to its -50% Darkness Resistance penalty.

Sword of the Father
Sword of the Father is obtained in Chapter 13, and for a portion of the chapter it is Noctis's only melee weapon. It is King Regis's sword and becomes one of Noctis's iconic weapons. It is the most notable royal arm alongside the Trident of the Oracle, as it is used in story scenes.

Sword of the Father briefly boosts its wielder's Strength after finishers. Attacking with it performs basic sword slashes, one of them leaving a hologram that damages enemies that come into contact with it like with the Trident of the Oracle. The last attack is a slow, but powerful and gives +200 Strength for 5 seconds. The finisher can be used to put enemies in Vulnerable state and then attack them with the boosted Strength. It is possible to skip to the finisher (works with any weapon) by starting a combo, stopping, and during the flourish where Noctis returns the weapon press attack again. With the Sword of the Father, the player won't skip right into the finisher, but into the thrust right before it.

Its aerial combo is same as with normal swords, and moving closer to an enemy to attack in a "mini warp" doesn't cost MP when attacking with it. Its phase-counter is a stab. Warp-striking with it leaves behind a damaging hologram. It consumes very little health.

Musical themes
When Noctis inherits a royal arm a version of "Somnus", the main theme of Final Fantasy XV, plays.

Creation and development
Noctis's ability to wield multiple crystalline weapons at once has been present ever since the Final Fantasy Versus XIII E3 2006 trailer where the game was revealed. In trailers for Final Fantasy Versus XIII Noctis was not the only one to wield the crystal weapons. He was opposed by a man in a white cloak, and Stella Nox Fleuret, both whom displayed similar skills to Noctis to summon phantom weapons from thin air. In the final game, the man in white is Ravus Nox Fleuret who doesn't have the power of Armiger, and Stella was replaced by Lunafreya Nox Fleuret who at one point wields a royal arm, albeit not in Armiger: the Trident of the Oracle.

Omen
Some of the royal arms appear in the short film for Final Fantasy XV depicting Noctis following Lunafreya's dog Pryna through various dreamscapes. Noctis wields the Sword of the Tall against imperial troops, and takes the Trident of the Oracle from Lunafreya during their battle and appears to have killed her with it while being possessed.

Final Fantasy XV Episode Duscae
Royal arms do not appear in the demo, but Noctis can collect four Phantom Swords to use in Armiger that take their place. The Phantom Swords are unique to the demo and are not collected from royal tombs, rather, they are found from the environment. Whenever Noctis collects a new Phantom Sword, he gains new abilities to his Armiger.

Mobius Final Fantasy
One of Ardyn's abilities is Sword of the Wise, the first royal arm the player earns in Final Fantasy XV.

For Whom the Alchemist Exists
Noctis is an obtainable character during the Final Fantasy XV collaboration event. The is shown wielding seven royal arms in Armiger.

Merchandise
Lunafreya's Play Arts Kai figure comes with the Trident of the Oracle. Noctis's Play Arts Kai figure comes with his Sword of the Father, albeit the figure in Ultimate Collector's Edition has another weapon in its stead.

Trivia

 * As a nod to its original title, Final Fantasy Versus XIII, Final Fantasy XV makes references to the number 13. There are thus thirteen royal arms and thirteen Lucian kings to wield them in the Knights of the Round.
 * If the player equips a royal arm as their main weapon and defends against ballistic fire, the royal arms will summon around Noctis to deflect bullets. This effect was first seen in the Final Fantasy Versus XIII reveal trailer where Noctis descends the stairs of the Citadel towards soldiers firing at him.