(Chaos VI) Ultrastorm Leviathan

Lore
Time and again, self-styled heroes fighting for self-styled justice faced off against the Leviathan. However, none possessed the might needed to fell the monster, and their unsatisfactory performances merely riled its temper further.

Acquisition
Evolve (Chaos I) Ultrastorm Leviathan with Leviathan Catalyst five times.

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