Adventurer from Another World

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After Noctis and his companions save the strange young woman Y'jhimei, she provides information about a dangerous 'primal' who shall soon be summoned into this world. The Chosen King turned brave 'adventurer' must now infiltrate an imperial base and put a stop to the summoning ceremony.
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Adventurer from Another World (異世界の冒険者, Isekai no Bōkensha?) is a collaboration quest with Final Fantasy XIV added in patch 1.27 in December 2018 to Final Fantasy XV. It is available from Chapter 5 onwards (after the events with Ramuh's Trial and the imperial base) and appears purple in the quest list, same as Close Encounter of the Terra Kind.

Noctis embarks on a journey with a Miqo'te called Y'jhimei who has come to Eos from Eorzea. Players who complete the quest receive 2,000 EXP, Final Fantasy XIV-themed attires and a new summon, as well as the ability to trade items for new ultimate weapons. Because the quest is a collaboration the graphics use the same stylization as Final Fantasy XIV, such as the "Accepted" text for taking on a quest and the boss battle being referred to as a "Duty".

The recommended level for the quest is 45 (same as for the final boss). There is no day and night cycle during the Perpetouss Keep part of the quest.

Characters

Y'jhimei (guest)

Garuda (boss)
Garuda (summon)

Quest

To start the quest, the player must head to Cauthess Rest Area. The player can fast-travel there if they have visited the location previously, and the quest starts as soon as the location loads. The retinue hears a voice and follows it to the warehouse where they find Y'jhimei stuck under a gargantuan chocobo. The party must go to Wiz Chocobo Post to buy Premium Gysahl Greens from the kiosk (they cost 500 gil and the player can only buy one) and give them to the chocobo to free Y'jhimei. She heads off to Perpetouss Keep where the party is to follow.

The player can now enter the keep by approaching the gate. Y'jhimei wants Noctis to follow her to her vantage point high above the keep, and the player must make their way to her. The player must make their way to her by jumping over and onto various structures. If they fall, the player can point-warp back to approximately where they fell and continue.

When catching up with Y'jhimei, the player must scout the area with binoculars to pinpoint points of interest before they can continue: the fenced off statue on the left side of the vantage point, the spherical teleporter at the right hand corner and a worshiping Ixal by the crystal formations (the crosshair needs to home in on the Ixal).

Besides these required points of interest, the player can also observe other minutiae, such as security bots patrolling at the back and a Kenny Crow statue.

After finding the points of interest Noctis and Y'jhimei regroup with Gladiolus, Ignis and Prompto and need to visit the previously pointed points of interest. Y'jhimei accompanies the party as a guest but she does not appear in the menu or in the user interface, and thus has no HP value or other visible stats or equipment.

The statue is the first point of interest to investigate. The player can open the gate at the front of them after regaining the use of Noctis after rejoining with the others to initiate a battle against spherical security robots, Mortar Systems. Y'jhimei stands aside a uses healing magic to aid the party. The bots do not attack but explode when defeated, which is easily done via warp-strikes.

After the battle the party investigates the statue of a Messenger of the Winds, which Y'jhimei says has a strange power emanating from within and Ignis explains it depicts the mysterious Messenger of the Winds whose very existence has been contested. The player is next to investigate the teleporter, having noted that the beastmen have taken over the base with no imperials in sight. The party observes the Meteorshards the Ixali are worshiping when they pass them.

On the way, going past various containers to a building, the player can pick up various healing items. The building has a message regarding an automatic magitek armor and inside a warehouse find a log on devising autonomous magitek armors. Outside, the party encounters more Mortar Systems and an Attack Node, which projects red laser beams. Opening the gate pits the party against a Level 10 MA-X Patria accompanied by more security bots. After defeating them, the player can approach the teleporter. Y'jhimei reveals she was the one who brought the Ixal to Eos, though by accident. Next to the next gate is a control room where the player can read a withdrawal order and pick up a Megalixir. Using the console unlocks all gates.

The way leads back to the beginning where they discover Y'jhimei's chocobo, whom Prompto names Mr. Chunkobo. Opening the gate leads to the boss battle against Garuda. The player simply needs to last until she destroys all meteorshards and the Messenger of the Winds is summoned, ending the battle and earning the player 2,500 EXP, Garuda as a summon and various Final Fantasy XIV-themed attires for the party to wear. The player can now fight the "proper" battle against a Lv.120 Garuda and use the trading post to ger new superior weapons. The player can explore the Perpetouss Keep but it is void of enemies or events, though the player can still collect any items they may have missed and read the various logs scattered about the premises.

Items

Unlike in the other "bonus quest" Close Encounter of the Terra Kind, the player keeps their normal inventory for the quest and the items discovered during the quest can be kept afterward.

Superior Restorative
Magitek Core (climb up a ladder, next to a blue/black/yellow spotted frog)
Elixir
Phoenix Down
Ether
Mega-Potion
Hi-Elixir
Megalixir

Farming Allagan Tomestones

A recording medium used in the ancient Allagan Empire of another world. Adventurers risk life and limb to collect these stones as a type of currency.
Description

Allagan Tomestones are items found in batches of 30 within the Perpetouss Keep used for trading in Y'jhimei's trading post after defeating Garuda. The player can find three batches of 30 tomestones for a total of 90 per playthrough of the quest. The tomestones can also be obtained from the boss, Garuda, however, this only yields them one at a time, making collecting them from the keep the superior method. If the player wants all the weapons available at the trading post, they can amass more tomestones via Chapter Select to reset the quest progress while keeping their items (however, this basically acts as a New Game Plus).

Enemies

Mortar System
Attack Node
Defense Node
Ixali Beastman
MA-X Patria
Garuda (boss)
Chirada (boss minion)
Suparna (boss minion)

Trading post

Exchange materials earned in combat for powerful arms inspired by the Lady of the Vortex

After finishing the quest, Y'jhimei opens a trade post at Perpetouss Keep where the player can trade for new ultimate weapons.

Gallery

Trivia

The player can read various logs around the base on what went on there before it was abandoned.
There are cats inside Perpetouss Keep during the quest. The talk icon appears when near them, but the player can't further interact with them. During the ending credits to the quest, Y'jhimei lies on the ground with a car sitting on her back and Prompto may take a photo of this scene for the player's album.
The keep has various colored frogs not seen elsewhere in Lucis. According to Sania Yeagre, frogs have been mutating especially rapidly lately.
The MA-X Patria fought at the keep is noted to being pilotless on a warning sign and as per a log left by a researcher in a warehouse. Whether all such MA are pilotless is unknown. However, when the player fights it as a mini boss, they can hear the Ixal talk over the intercom, implying they are piloting it, saying things like "confusing these buttons are" (although this dialogue is not subtitled and thus can he hard to discern amid the heat of battle).