Underdark Monsters

in Old-School Essentials Advanced Fantasy Genre Rules

• Brown Mould - A heat-absorbing fungus that feeds on energy and grows in darkness
• Bulette - Terrifying predator that resembles a gigantic armadillo crossed with a snapping turtle
• Coffer Corpse - Resembles a zombie, a rotting, fetid corpse of the dead left unburied
• Dark Creeper - Short, spindly humanoids with pale skin who wrap themselves in loose, dark clothing
• Deep One
• Drider
• Drow
• Duergar
• Ettin - Large, nocturnal two-headed creatures that live below ground
• Eye of Terror
• Flail Snail
• Flame Lizard
• Frost Toad
• Gas Spore - Strange, non-intelligent fungal creatures that resemble oculus
• Giant Mutant Frog
• Giant SLug - Large boneless creatures that spit acid and burrow through wood and earth
• Gibbering Mouther - A horrible creature seemingly drawn from a lunatic's nightmares with the fluid body of an amoeba
• Gullygug
• Hook Beast
• Hulker
• Krell
• Lurker Above - A subterranean creature resembling a manta ray that swims through the air and drops on prey from ceilings
• Mimic - A master of deception that can assume the shape of any object or creature
• Mind Lasher
• Multichromatic Dragon
• Mycelian
• Otyugh - Large creature with 4 legs, 8-foot diameter body, and 3 tentacles behind its mouth
• Piercer - A cone-shaped shelled creature resembling a snail that hunts by dropping from cave ceilings
• Roper - A 9-foot tall creature that tapers from 3-4 feet in diameter at the base to 1 foot at the top, weighing 2,200 pounds
• Shambling Mound - Intelligent plant creatures appearing as piles of rotting vegetation
• Spawn of the Worm
• Subterranean Lizard
• Svirneblin
• Trapper - An amorphous ambush predator that lies flat and mimics stone floors
• Violet Fungus - A purple to gray fungus that resembles a shrieker, attacks with poisonous tentacles
• Xorn - An embodiment of the element of Earth that glides through stone