Grindylows Small 15 ft. Grindylows are vicious, small aquatic aberrations combining the hideous, fanged visage of a goblin with the writhing lower body of an octopus. Haunting submerged sea caves and murky kelp forests, they ambush unwary swimmers with tangling tentacles, savage bites, and sudden bursts of speed. monstrous_race small aberration aquatic grindylow