Aeve, Progenitor Ooze, is an ancient ooze from an unknown plane.
History
At first there was nothing, just a bubbling primordial stew until lightning struck. That jolt of energy was exactly what was needed to jump-start the existence of Aeve, this plane's first living being. Some even believe that all other life on the plane came originally from this first oozing life form.
Billions of years have passed since that first lightning strike, and life has diversified and flourished in all sorts of forms. And still, Aeve persists, changeless and unbelievably ancient.