An adult Grick is a large snake-like creature weighing around 200 pounds and stretching about 8 feet long from the tip of its tentacles to the end of its tail. A grick’s body coloration is uniformly dark with a pale underbelly, and the tentacles attach just behind its head; the tentacles are segmented like the body of an earthworm.

A grick hunts by hiding near high-traffic areas, using its natural coloration to blend into the shadows; when doing this, the grick surprises on a 1-3 on 1d6. When prey ventures near, a grick lashes out with its tentacles. The jaws are small and weak compared to its body mass, so rather than consume its kill immediately, a grick normally drags victims back to the lair to be eaten at leisure.

Multiple gricks do not fight in concert; rather, each attacks the prey closest to it, and breaks off the fight as soon as it can drag a dead or unconscious victim away.