The illithid, or mind flayer, is an evil and feared creature of the Underdark; its powers are formidable and it feeds on the brains of any creature it encounters. Using arcane powers, it enslaves or destroys its foes, which include such powerful creatures as drow and kuo-toa. Mind Flayers stand about 6 feet tall and have hideous mauve skin that glistens with slime. The head resembles an octopus, with white eyes (no pupils are evident) and four tentacles around its mouth, a round, many-toothed orifice like that of a lamprey. The creature has three reddish fingers and a thumb on each hand. Instinct: To dominate

• Devour your brain
• Use the darkness
• Disturbing bioscience

The neogi appear as a cross between a wolf spider and a moray eel. The short, furry, eight-limbed body is topped by a lithe, bare, fleshy neck with a serpentine head, its mouth filled with needle-sharp teeth. The ends of its limbs are tipped with small claws. The fur of the neogi is a light tan, but dyed a variety of colors to signify power, rank, accomplishments, and warnings to other neogi. The older a neogi grows, the more colorful its hide becomes. The neogi are ruthless slayers and plunderers, and think nothing of eating their enemies, servants, or fallen comrades. They are a hateful, xenophobic race. Instinct: To enslave

• Capture and subjugate
• Skitter from the darkness
• Poison with bite, slowing opponent
• Summon an umber hulk

Umber hulks are powerful subterranean predators whose ironlike claws allow them to burrow through solid stone in search of prey. Umber hulks are tremendously strong, standing nearly 8 feet tall and over 5 feet wide. Muscles bulge beneath their thick, scaly hides and their powerful arms and legs all carry great claws. They have no necks to speak of, but the head features a powerful maw with rows of triangular teeth and 8-inch mandibles capable of biting through any hide or bone. Most peculiar of all are the four round eyes, spaced evenly across each umber hulk's forehead. Umber hulks are black, shading to a lighter shade of yellowish gray on the front. Their eyes are mere blackened dots each the size of a small coin. Instinct: To enforce the will of their neogi masters

• Slowly advance
• Create cave-ins
• Confusing gaze