Grimlocks are a fictional race of monstrous humanoids that live in the Underdark, a vast interconnected system of caves underneath various Dungeons & Dragons campaign settings. Based on subterranean humanoids called “Morlocks” created by H.G. Wells for his 1895 novel The Time Machine, the grimlock was first adapted for Advanced Dungeons & Dragons (AD&D), and has appeared in each subsequent version of D&D rules as a savage, pale-skinned and eyeless humanoid that dwells in dark places and prefers the taste of human flesh.