Leviathan

A Leviathan is a massive monstrosity that can only grow in very rare waters that can possibly support such life. In a place like Elion, however, where the planet is infinite and there is always more room to expand to, they thrive. A Leviathan has no size limit, like a dragon, but their growth will only slow by the rate at which they digest nutrients. They support most of their energy needs through magical conduits similar to most mega-fauna on Elion, but are so massive that a Leviathan can easily die without ingesting any beast it comes across.

Leviathans sport a number of offensive and defensive capabilities. Their shape and abilities are distinct between individuals, but they generally have massive claws and the ability to spit a mucus strong enough to entrap even a giant within it's terrible membrane. Several recorded Leviathans also have the added ability to wield magic, and some have been known to screech at such ear-splitting decibels that it has created tsunamis and churned the sea red with the blood of devastated ecosystems. These events, thankfully, are extremely rare and somewhat mythical.