Xinachto is an earthly spiritual guardian of Mazcab that takes the form of a large tortoise, and who plays a role in Call of the Ancestors. It is initially bound within the temple, and describes that it is there so that it may return to transform into anima to replenish the world.
During the quest, Xinachto instructs Peck, Tunks, and Lunch to perform the trial of their ancestors within the temple so that may achieve ancient magic powers from their completion. Afterwards, Lunch will break Xinachto free from its bindings.
After the quest, it can be found wandering around south of Otot. While it can be talked to, it will result in no conversation and the player will state that something feels different about it.