What follows is a brief summary of the forces of darkness at the Second Fall of Myth Drannor. Please note that even though it is not specified, many of those listed have magical or psionic ability, fighter or thief skills, and many, many of extremely powerful abilities unlisted:
The Baatezu

Agares (Pit Fiend Duke), Aglaeroch (Pit Fiend), Amnos (Amnizu), Analagos (Spinagon), Belhifet (Pit Fiend Duke), Belubaer (Gelugon), Dlanchass (Cornugon), Dlithgorkgh (Gelugon Mage), Dragathanak (Pit Fiend), Evanit (Black Dragon Mage), Faerlfeyd (Cornugon), George Tkepsi (Amnizu Priest), Geryon (Lesser Power), Glaungter (Cornugon), Ilitharghe (Cornugon), Laqu (Nightmare), Lashalot (Cornugon Mage), Lowbrow (Spinagon), Nuleerdra (Pit Fiend Mage), Oluubarga (Gelugon), Oumisser (Cornugon), Shorttail (Spinagon), T'u't'los (Amnizu Mage), Tarn Longtree (Erinyes Mage), Toothless (Spinagon), Ulogot (Amnizu), Wyrmkeeper (Osyluth Priest), Xarklara (Cornugon Priest).

Abishai (15), Amnizu (263), Barbazu (111), Cornugon (87), Crocodile, Erinyes (8), Fang Dragon Mage, Gelugon, Goshawk, Green Dragon (4), Hamatula (34), Hell Cat (32), Hell Hound (3), Imp (72), Lemure (108), Mephit (181), Nightmare (23), Nupperibo (154), Osyluth (117), Pit Fiend (2), Spinagon (617).

The Undead

Bonnar (Dwarf Vampire Priest), Bonny Clyde (Halfling Vampire), Deathcloud (Green Dragon Vampire Priest), Doronimus (Shade Mage), Druth Daern (Demilich Demipower), Ervan (Vampire), Illuminous the Faded (Gnome Vampire Mage), Kananatan Moonglaemer (Elf Vampire), Kluatas (Elf Vampire Mage), Pellanistra (Quickling Elf Vampire Priest), Salasalatalas (Wraith Priest).

Animal Skeleton (5000), Appariton (11), Banshee (14), Blazing Bones (160), Blood Spirit, Bone Naga (400), Coffer Corpse (20), Crawling Claw (30), Crimson Death (29), Crypt Thing (4), Death Dragon, Dread (500), Doomsphere (8), Elf Vampire (25), Flame Zombie, Foregathering Spirit, Ghast (80), Ghost (12), Ghoul (100), Greater Mummy, Green Dragon Wight, Heucuva (20), Hoodoo Man, Ju-ju Zombie (200), Monster Zombie (100), Mummy, Penanggalan (12), Red Dragon Zombie, Revenant (2), Shade, Shadow (1000), Sheet Ghoul, Sheet Phantom, Skeleton (1200), Skeleton Warrior, Son of Kyuss, Spectre (171), Vampire (48), War Mammoth, Wight (1000), Wizshade (90), Wraith (190), Zombie (160). 1