Ruins or Underground Terrain
Paizo
Amphisbaena
Ankhrav
Basidirond
Bhole
Black Pudding
Blindheim
Bogwid
Caryatid Column, Shining Sentinel
Cave Fisher
Cerebric Cyst
Charda
Choker Brute
Chon Chon
Chon Chon Swarm
Clawbat
Cloaker
Corpse Orgy, Fiery
Crawling Hand, Giant
Crypt Thing
Crysmal
Cytillipede
Darkmantle
Decapus
Delver
Derro
Derro Magister
Destrachan
Dog, Goblin
Dracolisk, Black
Dragon, Primal (Crystal)
Dragon, Prism
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Drider
Drow
Duergar
Duergar Tyrant
Egophage
Executioner's Hood
Faceless Stalker
Fear Eater
Flail Snail
Fungal Crawler
Fungus Queen
Gearghost
Gelatinous Cube
Gibbering Mouther
Glacier Toad
Golem, Marrowstone
Gorgon
Grick
Gryph
Gug
Half-Fiend Minotaur
Intellect Devourer
Irlgaunt
Khaei
Kobold
Lava Child
Lurker Above
Medusa
Mercane
Mite
Mobat
Mongrelman
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Morlock
Mu Spore
Naga, Dark
Necrophidius
Neothelid
Neothelid Overlord
Ochre Jelly
Orc
Orc, Floodslain
Oronci
Otyugh
Pech
Phycomid
Polevik
Psyche Serpent
Purple Worm
Qlippoth, Gongorinan
Redcap
Robot, Scrapyard
Rokurokubi
Roper
Rorkoun
Rune Guardian
Rust Monster
Serpentfolk
Seugathi
Seugathi Savant
Shoggoth
Shotalashu
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Shriezyx
Sinspawn (all 7 types)
Skaveling
Skulk
Skum
Slime Mold
Slithering Tracker
Slug, Giant
Slurk
Solifugid
Spider, Giant Black Widow
Stygira
Svirfneblin
Tenebrous Blight
Tentamort
Totenmaske
Trapper
Troglodyte
Urdefhan
Vampiric Mist
Vegepygmy
Vemerak
Violet Fungus
Xulgath
Yellow Musk Creeper
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Other Sources 
Aberrant[3PP]
Agathion, Chiropteal[3PP]
Amalgamation[3PP-FGG]
Amphisbaena[3PP-FGG]
Arach[3PP]
Arcanoplasm[3PP]
Archer Bush[3PP]
Baric[3PP]
Barrow Rat[3PP]
Basidirond[3PP-FGG]
Basilisk, Crimson[3PP]
Bedlam[3PP]
Beetle, Carrion[3PP-KP]
Beetle, Requiem[3PP]
Behemoth Pudding[3PP]
Bhuta[3PP-FGG]
Black Worm[3PP-JBE]
Blightrat[3PP-JBE]
Blindheim[3PP-FGG]
Blood Orchid[3PP-FGG]
Blood Pudding[3PP]
Bone Collective[3PP-KP]
Bone Crawler[3PP-FGG]
Bonesucker[3PP]
Brain Rat[3PP]
Carrion Claw[3PP-FGG]
Cave Cricket[3PP]
Cave Fisher[3PP-FGG]
Cave Leech[3PP]
Cave Moray[3PP]
Cavelight Moss[3PP-KP]
Cavern Lizard[3PP]
Chain Worm[3PP]
Chelicerae[3PP-KP]
Corpse Orgy[3PP]
Crag Man[3PP]
Crimson Death[3PP-FGG]
Crypt Thing[3PP-FGG]
Darakhul Ogre[3PP-KP]
Dark Creeper[3PP-FGG]
Dark Stalker[3PP-FGG]
Decapus[3PP-FGG]
Demi-Lich[3PP-FGG]
Derro Fetal Savant[3PP-KP]
Devouring Mist[3PP-FGG]
Diger[3PP-FGG]
Dire Corby[3PP-FGG]
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Doombat[3PP]
Draconid[3PP-FGG]
Dun Pudding[3PP]
Ethereal Filcher[3PP]
Ethereal Rat[3PP]
Executioner's Hood[3PP-FGG]
Eye Killer[3PP-FGG]
Fear Guard[3PP]
Fire Lizard[3PP]
Flail Snail[3PP-FF]
Flail Snail[3PP-FGG]
Flea, Giant[3PP]
Flumph[3PP-FGG]
Frog, Killer[3PP-FGG]
Frog, Killer[3PP-FF]
Frost Man[3PP]
Fungus Man[3PP-FGG]
Fungus Man King[3PP-FGG]
Fungus, Phantom[3PP-FF]
Gelatinous Orb[3PP-APRR]
Ghoul, Bonepowder[3PP-KP]
Ghoul, Imperial[3PP-KP]
Ghoul, Iron[3PP-KP]
Gibbering Abomination[3PP-FGG]
Glass Wyrm[3PP-FGG]
Gloom Crawler[3PP-FGG]
Goblin Naga[3PP-CD]
Gohl (Hydra Cloud)[3PP-FGG]
Grimlock[3PP]
Gryph[3PP-FGG]
Gug Savant[V]
Gutslug[3PP-FGG]
Hag, Blood[3PP-KP]
Hag, Flue[3PP-PFU]
Helix Moth, Larva[3PP]
Huggermugger[3PP]
Inphidians[3PP]
Jelly, Tar[3PP-AP]
Kampfult[3PP]
Killmoulis[3PP]
Land Lamprey[3PP]
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Lava Child[3PP-FGG]
Lurker Above[3PP-FGG]
Mantari[3PP]
Mantidrake, Any[3PP]
Meat Puppet, Human[3PP-FGG]
Meat Puppet, Otyugh[3PP-FGG]
Minotaur, Bleeding Horror[3PP-FGG]
Mite[3PP-FGG]
Mongrelman[3PP-FGG]
Moss, Cavelight[3PP-KP]
Mudman[3PP-FGG]
Nilbog[3PP]
Ogrillon[3PP]
Orcish Warclops[3PP]
Otyugh, Corpsefeaster[V]
Otyugh, Mutant[V]
Otyugh, Oozing[V]
Otyugh, Plaguebearer[V]
Pestie Mite[3PP]
Phase Flea[3PP-FGG]
Phrenic Scourge[3PP]
Phycomid[3PP-FGG]
Possessor[3PP]
Pyrolisk[3PP-FGG]
Rock Reptile[3PP]
Roper, Stone[3PP]
Rust Monster, Rust Lord[V]
Scanderig[CNV]
Shadow Hunter[3PP-FGG]
Shadow Hunter Hatchling[3PP-FGG]
Shadow Rat[3PP]
Shrieker[3PP-FF]
Silid[3PP]
Skeleton, Black[3PP]
Skin Stitcher[3PP]
Skulleton[3PP]
Slaughterford (Reaperborn)[3PP-FGG]
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Slithering Tracker[3PP-FGG]
Slug, Giant[3PP-FGG]
Soul Reaper[3PP-FGG]
Spider, Albino Cave[3PP-FGG]
Spore Rat[3PP]
Spriggan[3PP-FGG]
Stirge Swarm[3PP-FGG]
Stone Pudding[3PP]
Stone Treant[3PP-FGG]
Stun Jelly[3PP]
T'shann[3PP]
Tentacled Horror[3PP]
Tentamort[3PP-FGG]
Troglodyte, Stone[3PP-FF]
Trollhound, Rock[V]
Tunnel Worm[3PP]
Vilstrak[3PP]
Volt[3PP]
Vulchling[3PP]
Weird, Fungus[3PP-FGG]
Well Lurker[3PP-FGG]
Whip Jelly[3PP]
White Pudding[3PP]
Yellow Musk Creeper[3PP-FGG]
Yellow Musk Zombie[3PP-FGG]
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