(Chaos II) Ultrastorm Leviathan

Lore
The Leviathan was not only the strongest creature of the seven seas, but the bearer of the greatest negative energy. The gods had intended for it to fight against the forces of justice, and at first it was more than willing to serve this role.

Acquisition
Evolve (Chaos I) Ultrastorm Leviathan with Leviathan Catalyst once.

Name origin
Leviathan is a creature with the form of a sea monster from Jewish belief, referenced several times in the Hebrew Bible.