List of all monsters across these books.
Actaeon
Agarat
Ash Crawler
Baldandar
Bargda
Bhut
Bird (Mystara)
Blackball
Choker
Coltpixie
Crone of Chaos
Darkhood
Darkwing
Decapus
Deep Glaurant
Diabolus
Dimensional Warper
Dragon (Mystara), Crystalline
Dragon (Mystara), Jade
Dragon (Mystara), Onyx
Dragon (Mystara), Ruby
Drake (Mystara)
Dragonfly
Dusanu
Elemental of Chaos, Air/Earth
Elemental of Chaos, Fire/Water
Elemental of Law, Air/Earth
Elemental of Law, Fire/Water
Familiar (Mystara)
Frost Salamander
Fundamental, Air/Earth
Fundamental, Fire/Water
Gargantua (Mystara)
Geonid
Ghostly Horde
Giant, Athach
Giant, Hephaeston
Golem, Drolem
Golem (Mystara) I
Golem (Mystara) II
Golem (Mystara) III
Gray Philosopher
Guardian Warrior
Gyerian
Herex
Hivebrood
Horde
Hsiao
Huptzeen
Hutaakan
Imp (Mystara)
Jellyfish, Giant (Mystara)
Kna
Kopru
Lizard (Mystara)
Lizard-kin (Mystara)
Lupin
Lycanthrope, Werejaguar (Mystara)
Lycanthrope, Wereswine
Magen
Manikin
Mek
Mujina
Nagpa
Neh-thalggu
Nightshade (Mystara)
Nuckalavee
Pegataur
Phanaton
Plant, Dangerous (Mystara)
Plasm
Rakasta
Rock Man
Sabreclaw
Sacrol
Scamille
Shapeshifter
Shargugh
Shark-kin
Sollux
Spectral Death
Spectral Hound
Spider-kin
Spirit (Mystara)
Statue, Living
Surtaki
Tabi
Thoul
Thunderhead
Tiger, Ebon
Topi
Tortle
Vampire, Velya
White Fang
Worm (Mystara)
Wyrd
Yowler
Zombie, Lightning
Aranea (Savage Coast)
Arashaeem
Batracine
Caniquine
Cat, Marine
Cinnavixen
Clockwork Swordsman
Critter, Temple
Cursed One
Deathmare
Dragon (Savage Coast), Crimson
Dragon (Savage Coast), Red Hawk
Echyan
Ee'aar
Enduk
Fachan (Savage Coast)
Feliquine
Fiend, Narvaezan
Frelôn
Ghriest
Glutton, Sea
Goatman
Golem, Naâruk
Golem (Savage Coast)
Grudgling
Heraldic Servant I
Heraldic Servant II
Heraldic Servant III
Heraldic Servant IV
Heraldic Servant V
Heraldic Servant, General Information
Hermit, Sea
Jorri
Juhrion
Kla'a-tah
Leech, Legacy
Lich, Inheritor
Lizard Kin (Savage Coast)
Lupasus
Lupin
Lyra Bird, Saragón
Malfera
Manscorpion, Nimmurian
Mythuínn Folk
Neshezu
Nikt'oo
Nosferatu
Omm-wa
Omshirim
Parasite (Savage Coast)
Phanaton
Plant (Savage Coast)
Pudding, Vermilion
Rakasta
Ray, Forest
Shedu, Greater (Savage Coast)
Shimmerfish
Skinwing
Spawn of Nimmur
Spider-spy
Spirit, Heroic
Spirit, Walleran
Succulus
Swampmare
Symbiont, Shadow
Tortle
Troll, Legacy
Trosip
Tyminid
Utukku
Voat
Voat, Herathian
Vulturehound
Wallara
Wurmling
Wynzet
Yeshom
Zombie, Red
Bloodsipper (Far Realm)
Dharculus
Neh-thalggu
Troll Mutate
Wyste