The cool, refreshing water suddenly erupts in a storm of reaching, grasping tentacles. The tentacles connect to a primeval fish, 20 feet in length from its bulbous head to its crescent-shaped tail. Three slit-shaped eyes, protected by bony ridges, are set one atop the other in the front of its head, which remains just beneath the surface as it attacks!
The aboleth is a revolting fishlike amphibian found primarily in subterranean lakes and rivers. An aboleth has a pink belly. Four pulsating blueblack orifices line the bottom of its body and secrete gray slime that smells like rancid grease. It uses its tail for propulsion in the water and drags itself along with its tentacles on land. An aboleth weighs about 6,500 pounds. An aboleth attacks by flailing with its long, slimy tentacles, though it prefers to fight from a distance using its illusion and psychic powers.
Aboleths have powerful psionic powers and are natural psions like mind flayers and many other denizens of the Far Realm. However, aboleths have a much more fearsome ability, the capacity to secrete a viscous gray fluid, much like mucus, which brings about a terrible transformation in air-breathing creatures so unfortunate as to be caught in the stuff. The skin of the victim is transformed into a membrane which allows it to breathe in water, and changes the creatures consciousness to that of a mindless servant’s. This allows aboleths to keep slaves, known as aboleth servitors, which they dominate and keep captive through their mind. Only the most powerful aboleths can do this, however, completing the process through a powerful ritual.