Leviathan

Leviathan can spawn as a rare Naraka event, but the spawn is so rare that most players will never see it naturally. Crafting a leviathan capsule is far easier than waiting for the event.

The fight is an acid-rain event. While Leviathan is active, acid rain starts and the area stays dangerous for a little over three minutes, melting exposed targets and chewing through terrain.

That weather matters outside the fight itself. In ordinary play, Leviathan acid rain is the only way to kill Meeshuu, which makes Leviathan the only route to an archangel capsule.

Leviathan is not tied to the rosary ending route. The final route goes to Yhvh instead. Killing Leviathan itself drops a thorn talisman.