Gricks attack when hungry or threatened. They hunt by holing up near high-traffic areas, using their natural coloration to blend into convenient shadows. When prey (virtually anything that moves) ventures near, they lash out with their tentacles. A grick's rubbery body seems to shed blows of any kind. Its jaws are relatively small and weak compared to its body mass, so rather than consume its kill immediately, a grick normally drags its victim back to its lair to be eaten at its leisure.

A grick's natural weapons are treated as magic weapons for the purpose of overcoming damage reduction.

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