from the AD&D Monster Manual

Umber Hulk

CREATURE TYPE: Monster
CLIMATE/TERRAIN: Any/Subterranean
FREQUENCY: R
ORGANIZATION: Solitary
ACTIVITY CYCLE: Any
DIET: Carnivore
INTELLIGENCE: 8-10
TREASURE: G
ALIGNMENT: CE
NO. APPEARING: 1-4
ARMOR CLASS: 2
MOVEMENT: 6, Br 1-6
HIT DICE: 8+8
THAC0: 11
NO. OF ATTACKS: 3
DAMAGE/ATTACK: 3d4/3d4/1d10
SPECIAL ATTACKS: Yes
SPECIAL DEFENSES: No
MAGIC RESISTANCE: 0
SIZE: L
MORALE: 13
XP VALUE: 4000
HOME PLANE: Prime Material
PAGE NO.: MM 352 OMI 98

iron-like claws, strong, dig to corridor & peak thru crack waiting for victim (-5 opp surp), attack: claw/claw/bite infravison 90', if you look into its eyes save vs spell or confusion, will not fight to death, raid dungeouns for food, prefer human prey