Agartoise, also known as Agart Turtle, is a boss from Final Fantasy IV: The After Years, appearing inside a treasure chest deep in Agart Mine during Rydia's Tale. It drops loot needed to repair the Falcon and Calca & Brina.
Agartoise's main method of offense is to attack with a strong physical attack. It can also store up energy to unleash a devastating Blaze attack on the party, and if attacked with anything other than Ice-elemental weapons or spells, it will counter with Flamethrower. It is recommended to fight it if entire party member level 43/higher because the damage that i took in one Blaze is 1000-2000. Upon being defeated, it will always yield the Agartite.
Agartha is a legendary city that is said to reside in the earth's core. It is related to the belief in a hollow earth and is a popular subject in esotericism.