(Chaos X) Ultrastorm Leviathan

Lore
The Leviathan only rose from the ocean depths to fight. The moment the heroic figure appeared on the cliff side, it breached the surface, jaws opened wide, to unleash a scorching beam of energy. An offensive no less fierce would suit such an adversary, but it was far from decisive. The two avatars of good and evil then became entwined in battle until balance was restored to the cosmos and they accepted each others' solitude in superiority.

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

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