Aboleths are a race of malevolent, eel-like aberrations with potent psionic abilities. From what what pieced together, Ma'ar had summoned one as either an experiment or to utilize in his corruption of other races. By the time the one located in Ma'ar's stronghold was faced, it had gone quite mad in the millennia since its summoning.
The aboleth was a fish-like amphibian of immense size, reaching around 20 feet in length and weighing up to 6,500 pounds, though that size may be restricted due to the pool of water it was confined to. Rumors of the creatures in the open seas state they can continue to grow as they aged and some fantastically ancient specimens might reach 40 feet in length. They resemble a bizarre eel, with long, tubular bodies, as well as a tail at one end and two fins near the head and another along the back. Aboleths' mouths are lamprey-like, filled with serrated, jawless teeth.
The Aboleth's underbelly was orange-pink, while the topside was sea-green. A little bit back from the head were four long tentacles, two sprouting from across each other on the top, and two more of the same on the underbelly. The head was roughly triangular-shaped, with a spherical, somewhat beak-like nose. Above the nose was their three eyes, each one set atop the other, along with a cluster of three eyes on either side of the head. Tendrils and a few shorter tentacles dangled from the bottom of the head. Four blue-black slime-secreting orifices lined the bottom of their bodies. Aboleth blood was green and thick, oozing like sap.
Aboleths seem to breath through a thick gray mucus-like substance, which covered its body and which it exuded from four pulsating organs along its body as it moved. If robbed of the ability to exude this slime, an aboleth would likely suffocate in water or on land alike. Out of the water, the membrane-like skin seems to dry out quickly.
The aboleth had powerful psionic powers, but a much more fearsome ability: the capacity to secrete a viscous gray fluid, much like mucus, which brought about a terrible transformation in air-breathing creatures so unfortunate as to be caught in the fluid. The skin of the victim was transformed into a membrane that allowed it to breathe in water, and could potentially change the creature's consciousness to that of a mindless servant. This allowed the aboleth to keep slaves, seemingly the kuo-toa and sahuagin found nearby, which they dominated and kept captive through their mind.
