Yzak is the Chief God and Sovereign of the Disaster Abyss World Evezeino.
Yzak acts according to his cravings and lives to satisfy his own desires. He is very eccentric and as whimsical as one can get. He is ferocious and wild but is self-aware of the fact that he's viewed as crazy. His do-what-you-want-to-do mentality is what makes him such an unpredictable wild card.
Yzak is both the Chief God and Sovereign of Evezeino, which is likely possible due to his unique nature as a half-god, half-demon. As a calamity that destroys the world on a whim, Yzak possesses enough power to be considered one of the Inviolable Waters. He led his world in numerous battles against the Holy Sword World Hayfolia, whose world and inhabitants were fundamentally different than his. Whereas Yzak and the phantom beasts were driven by irrational craving, Hayfolia's noble hunters were driven by irrational righteousness. Yzak battled its Sovereign, the legendary Holy King Ordov Heinriel, and gained a begrudging respect for him.
It's believed that he lost interest in the world a long time ago, and fell asleep since that was his strongest craving at the time, though he will awaken when someone that could stimulate his craving appears.
It should be noted that the relationship between Yazak and Ordov closely parallels the relationship shared between Hero Canon and Anos, as the two went from arch rivals to friends over the course of their battles.
(Source: Maou Gakuin Wiki)
Content compiled by AnimeList.moe from publicly available sources.
