Originally from Charos, Grell are fearsome predators who exist only to devour other living beings. These aberrations live in the Underdark and work closely with the race of Illithids.

With their bulbous head-body and trailing tentacles, grell resemble bloated flying jellyfish about five feet in diameter. Their gray-green mass is covered in folds and wrinkles and appears like nothing so much as an enormous brain with a hard bony beak. The creatures have no eyes, instead perceiving the world by receiving sound waves and electrical impulses through their skin, which functions as a single huge ear.

A grell has ten pink or purple prehensile tentacles with retractable barbs that inject a paralytic toxin. Grell grow continuously, reaching a maximum size of fifteen feet in diameter before their bodies become too large for their organs to support around their 250th year.

Most of these creatures are “feral” grell, solitary or pack hunters that live in ruins or caverns and hunt by dropping down on unsuspecting prey, then carrying them off while they are paralyzed. On occasion, though, grell come together in large colonies led by “philosophers” with magical talent under the will of a single patriarch of advanced age, size, and intelligence.

Such “colonial” grell have access to magic items and benefit from organized leadership, but are otherwise no different from their feral cousins. The distinction between feral and colonial grell is an artificial one, and a single grell may go back and forth between the two lifestyles several times in its lifetime.

Grell are as intelligent as humans and possess an alien tradition of magic, but have little in the way of society or culture. They do not build any structures save for the occasional low wall or shelf in their lairs (made from “grell crystal”, a substance grown from the grell’s own powdery excrement mixed with water) and only craft strange magical weapons such as the wand-like lightning lance.

Grell concern themselves entirely with the consumption of live flesh, and do not treat with humanoids unless completely overpowered - and even then, the more powerful party is still seen as a potential meal. At most, humanoids and animals are kept in underground pens for later eating, but grell are neglectful keepers and such “livestock” often die of starvation.