There are eight sealed doors located around the Lucian frontier, and behind each one slumbers a ferocious fiend that attacked the realm in ancient times. As the latter-day king, it is Noctis's royal duty to eliminate the menaces once and for all.
Menace Beneath Lucis is a sidequest in Final Fantasy XV that becomes available by defeating the game and continuing to play into Chapter 15. The player must also complete the following dungeons: Costlemark Tower, Crestholm Channels, Balouve Mines, and Daurell Caverns. Once these conditions have been met, one must travel to Meldacio Hunter HQ southeast of the Vesperpool to meet an elderly woman named Ezma Auburnbrie sat outside the diner. She will hand Noctis the Sealbreakers Key, a mystical key used to seal away a great evil, said to be forged by a Lucian king and an Oracle of yore. The key does not carry over to New Game Plus or when using chapter select.
The daemon lurking deep within knows no single form
By neither blade of flame not lance of frost can it be torn
Such menaces have terrified the kingdom throughout time
But now they must be punished for committing wicked crimes
Should we wish to vanquish these menaces once and for all
There is but one method by which our problem can be solved
We must seal the daemons away far beneath the ground
And await the day one who can dispel the darkness is found
The sealed doors conceal a tremendous danger. When they were created is unknown, and whether they were all created by the same person(s), but the key to them was said to have been forged by a king and an Oracle long ago. What is known is that they were created by a king of Lucis and an Oracle in a time daemons had emerged in Lucis. The Wall is mentioned on a monolith, and if this refers to the "new Wall" rather than the Old Wall, it would give the time frame of 150 years ago at most, at least for that particular menace dungeon.
A king and an Oracle sealed beasts dubbed "menaces"—beasts too strong for them to fell—underground for the True King to eventually deal with, believing their Chosen heir to be strong enough to take on the challenge. The menace dungeons became a closely guarded secret of the royal family, as the rulers greatly regret their inability to protect their realm from these monsters, only managing to contain the threat into the future. The king(s) left behind messages engraved on monoliths to the king who would one day brave the dungeons' depths.
According to Ezma, the doors were only a temporary solution and would eventually break. Knowing this, she waited for someone she thought capable of destroying the monsters to entrust the key. Regis Lucis Caelum met Ezma during his journey 30 years ago. Ezma believed Regis could destroy the monsters, but due to the circumstances of his journey, he was unable to. He promised he would take the task when the war with Niflheim was over. When Niflheim decimated Insomnia, this promise was thought to be lost, but Prince Noctis, Regis's son, would end up fulfilling it unknowingly. As Noctis and his retinue scour the dungeons they learn of the past rulers' plight from the monoliths, convincing Noctis he must finish what his ancestors had started and destroy the daemons within.
The party receives eight quests to travel throughout Lucis and defeat the mini-bosses at the end of each dungeon. The Sealbreaker opens the sealed doors in eight different dungeons:
- Keycatrich Trench
- Greyshire Glacial Grotto
- Fociaugh Hollow
- Daurell Caverns
- Balouve Mines
- Steyliff Grove
- Crestholm Channels
- Costlemark Tower
Completing all eight quests rewards the player with the Hunter's Medal Treasure.
Menace Beneath LucisEdit
|Menace Beneath Lucis||Cleigne||Complete storyline dungeons, Balouve Mines, Crestholm Channels, Daurell Caverns and Costlemark Tower||0 EXP, Hunter Medal|
This quest requires all menaces to be defeated. Once completed, the player can return to Ezma to get the Hunter Medal and complete Ezma's dossier.
A Menace Sleeps in KeycatrichEdit
|A Menace Sleeps in Keycatrich||Keycatrich Trench||Commence "Menace Beneath Lucis"||0 EXP|
Defeating the final boss will earn the firearm Hyper Magnum.
The recommended level for this dungeon is 55.
A Menace Sleeps in FociaughEdit
|A Menace Sleeps in Fociaugh||Fociaugh Hollow||Commence "Menace Beneath Lucis"||0 EXP|
Defeating the final boss earns the sword Enhancer.
The recommended level for this dungeon is 65.
A Menace Sleeps in the GrottoEdit
|A Menace Sleeps in the Grotto||Greyshire Glacial Grotto||Commence "Menace Beneath Lucis"||0 EXP|
There are two camps. After the first camp, paths branch out twice; the first time the player must take the path leading right, the second time they must take the middle path. After the second camp, the next time there are branching paths, the player must take the left path.
Defeating the final boss will earn the firearm Executioner. Other good treasures at the grotto are the Vigilantes daggers (first haven), and the Black Belt (+50% damage to larger enemies for Gladiolus) and Safety Bit (immunity to Instant Death) accessories.
The recommended level for this dungeon is 65.
A Menace Sleeps in Daurell CavernsEdit
|A Menace Sleeps in Daurell Caverns||Daurell Caverns||Commence "Menace Beneath Lucis"||0 EXP|
Defeating the final boss will earn the polearm Precision Lance.
The recommended level for this dungeon is 72.
A Menace Sleeps in BalouveEdit
Defeating the final boss will earn the Firearm Death Penalty.
The recommended level for this dungeon is 78.
A Menace Sleeps in SteyliffEdit
|A Menace Sleeps in Steyliff||Steyliff Grove||Commence "Menace Beneath Lucis"||0 EXP|
Defeating the final boss will earn the polearm Flayer.
The recommended level for this dungeon is 86.
A Menace Sleeps in CrestholmEdit
|A Menace Sleeps in Crestholm||Crestholm Channels||Commence "Menace Beneath Lucis"||0 EXP|
Defeating the final boss will earn the accessory Gigas Bangle.
The recommended level for this dungeon is 92.
A Menace Sleeps in CostlemarkEdit
|A Menace Sleeps in Costlemark||Costlemark Tower||Commence "Menace Beneath Lucis"||0 EXP|
Defeating the final boss will earn the accessory Dark Matter Bracelet.
The recommended level for this dungeon is 99.