To find the Adamantoise, the player must use Umbra to return to the past once the feature is available, and then take the Let Sleeping Mountains Lie quest from Cindy at the Hammerhead station. The quest concludes with the party discovering that the mountain at Longwythe Peak is actually the Adamantoise, which they then flee from. The player can now accept the Lonely Rumblings in Longwhythe hunt from Takka at his restaurant by the Hammerhead.
After defeating Adamantoise, if the player talks to Dave Auburnbrie, he will take the player to the local restaurant where up to 14 non-playable characters congratulate Noctis's party and yield an Oracle Ascension Coin each. How many people attend depends on how many key quest-givers Noctis has interacted with. Cid will mention Regis once took on the Adamantoise, but was not able to finish it off. The Adamantoise Meat the Adamantoise sometimes procures can be used to cook Longwythe's Peak.
- Largest and oldest living creature known to man. Said to have been born at the dawn of time itself, the adamantoise first appears in documents produced circa the advent of the Kingdom of Lucis. According to said records, metal procured from its shell was used in the construction of conduits used to channel the Crystal's power into the Wall around the Crown City.
- Size: 2,340.97 ft. Weight: 17,398,421.50 t
|Lonely Rumblings in Longwythe||Hammerhead||Adamantoise x1||Longwythe Peak (All Times)||99||50,000 gil, Adamantite Bangle||★★★★★|
Adamantoise takes a long time to kill, due to its 5,264,400 HP. Before the game had released, Director Hajime Tabata had mentioned 30 in-game days, which would be close to 15 hours in real time. However, in the actual game, the fight takes most players roughly 2 hours, or 3 in-game days.
Adamantoise's attack patterns are predictable due to its size and it glows yellow right before it attacks. The player can attack its feet and head. Despite its immense size, the Adamantoise doesn't do extreme damage, so the battle is doable on lower levels, although being on higher level makes the battle faster. The eyes and the neck are Adamantoise's vulnerable points.
After patch 1.06 Ring of the Lucii's Death and Alterna work against Adamantoise. If Titan is summoned in this battle, he has a unique animation. The battle also has a unique group parry, triggered by standing just to the right or left of the tortoise's head when he lifts his head and slams down.
As long as the player avoids using greatswords, they should be able to take the Adamantoise down easily. To hasten the battle, the player can use Armiger whenever possible.
Eating Golden Tail Soup before the battle guarantees a 100% critical hit rate. Zwill Crossblade is a good weapon to equip for the battle for its strength and fast attack speed. If the player has them, Ulric's Kukris are a good weapon for Ignis. The player can also use Ragnarok and warp-strike, or Ultima Weapon, or just use the Ring. Unlocking the Airstep nodes in the Ascension is useful.
Combining these methods, the battle can be done in as little as 15 minutes if the party is on a high level.
The Adamantoise is fought as a boss in Final Fantasy XV event dungeons, usually as a high-level enemy. Its leg and head are separate targets.
Adamantoise is a portmanteau of "adamantite" and "tortoise".
Adamantite and similar words including Adamant and Adamantine are used to refer to any especially hard substance, whether composed of diamond, some other gemstone, or some type of metal.