Old-School Essentials Advanced Fantasy Genre Rules
Monsters (118)
A
- Amphisbaena
- Ankheg - Large insect-like monster with a taste for fresh meat that burrows beneath forests and farmlands
- Aquatic Spider
- Aranea - Intelligent, shape-changing, spider-like creature with magical abilities
B
- Banshee - Fey undead resembling a colorless, ash-white elf in ragged clothing and chains
- Behemoth Hippopotamus
- Black Hag
- Brass Dragon
- Bronze Dragon
- Brown Mould - A heat-absorbing fungus that feeds on energy and grows in darkness
- Brownie - A small fey being closely related to pixies and sprites, an elf-like creature about 2 feet tall
- Bulette - Terrifying predator that resembles a gigantic armadillo crossed with a snapping turtle
C
- Caryatid Column - Intricately-carved columns in the shape of a person, created as guardians
- Catoblepas - A fantastically ugly creature with a warthog-like face and body, a long neck, and a powerful tail ending in a bone club
- Clay Golem - Man-shaped figure created from clay by a lawful good cleric
- Coffer Corpse - Resembles a zombie, a rotting, fetid corpse of the dead left unburied
- Copper Dragon
- Couatl - A powerful and legendary large serpent with feathered wings and shape-changing abilities
D
- Dark Creeper - Short, spindly humanoids with pale skin who wrap themselves in loose, dark clothing
- Deep One
- Demonic Knight
- Disenchanter - A bizarre creature resembling a cross between a dromedary camel and a cow with a muscular prehensile snout, shimmery electric blue and translucent
- Djinni (Greater)
- Dragonne - A strange combination of a lion and dragon with brass-colored scales and stiff hair
- Drider
- Drow
- Duergar
E
- Efreeti (Greater)
- Ettin - Large, nocturnal two-headed creatures that live below ground
- Eye of Terror
- Eye of the Deep - Globular aquatic monster with a massive central eye, two eyestalks, lobster-like pincers, and a gaping maw
G
- Gas Spore - Strange, non-intelligent fungal creatures that resemble oculus
- Ghast - Undead monsters similar to ghouls but smarter and more powerful, surrounded by an overwhelming stench
- Giant Electric Eel
- Giant Jellyfish
- Giant Lamprey
- Giant Mantis
- Giant Mutant Frog
- Giant Pike - Aggressive predators found in larger and deeper lakes
- Giant Poisonous Frog
- Giant SLug - Large boneless creatures that spit acid and burrow through wood and earth
- Giant Swordfish
- Giant Wasp - Giant wasps with paralysing poison stingers that carry victims to their nests
- Gibbering Mouther - A horrible creature seemingly drawn from a lunatic's nightmares with the fluid body of an amoeba
- Gorilla
- Gullygug
H
- Hippocampus - The horse of the sea, with a mane that looks like seaweed and a dolphin's tail
- Hook Beast
- Hulker
- Hunting Dog
I
- Iron Golem - Powerful construct made of iron that can breathe poison gas
J
- Jackalwere - Strange shapeshifting creatures that can assume jackal or human form
L
- Lamia - Upper body of a beautiful woman, lower body of a venomous snake
- Leprechaun - The "wee folk" are related to the other fey races of brownies, pixies, and sprites
- Leucrocotta
- Lich - An undead former Magic-user or Cleric who used dark magic to prolong its life into undeath
- Locathath
- Lurker Above - A subterranean creature resembling a manta ray that swims through the air and drops on prey from ceilings
M
- Malfyr
- Mantid
- Merrow
- Mimic - A master of deception that can assume the shape of any object or creature
- Mind Lasher
- Monitor Lizard - Aggressive carnivores found in warm regions with dark grey and black colouration
- Multichromatic Dragon
- Mutoid
- Mycelian
N
- Necrophidius - A skeletal giant snake with a fanged skull of an adult human male for a head
- Nightmare - Otherworldly black warhorse with blood red eyes, fiery nostrils, and burning hooves that serves as a mount for powerful evil beings
- Normal Hippopota
O
- Otyugh - Large creature with 4 legs, 8-foot diameter body, and 3 tentacles behind its mouth
P
- Peryton - Strange chimerical creature combining the wings, body, and legs of a large bird with the head, neck, and antlers of a deer or stag
- Phase Spider - A spider able to shift in and out of reality during combat
- Phoenix - A huge, magnificent scarlet-plumed magical bird of surprising intelligence
- Piercer - A cone-shaped shelled creature resembling a snail that hunts by dropping from cave ceilings
- Poisonous Toad
- Poltergeist - Non-corporeal invisible spirits of humans who died tragically or were murdered
- Pseudo-Dragon - Tiny dragons with deadly sting in their tails, lacking breath weapon
R
- Rakshasa - Tiger-headed humanoids with backward-curving claws who use illusions to disguise themselves
- Remorhaz - Light blue centipede-like creature that pulses with reddish glow from intense body heat
- Revenant
- 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
- Rot Grub - 1-inch long vermin found in carrion, dung, and other organic material
S
- Sahyagin
- Satyr - A creature with the upper half of a man and the lower half of a goat, with red or chestnut brown hair, and jet black hooves and horns
- Scorpionoid
- Sea Hag - A horrible creature that appears as an old crone whose bent shape belies her power and swiftness
- Sea Serpent - Serpentine monsters which live in the sea, ranging from 20' to 40' long
- Sea Turtle
- Seahorse, Giant - An actual seahorse which grows almost to the size of a pony
- Shambling Mound - Intelligent plant creatures appearing as piles of rotting vegetation
- Silver Dragon
- Slithering Tracker - A transparent slime monster, similar in nature to the gelatinous cube but smaller and more amorphous
- Snake Person
- Snapping Turtle - Reptiles with a hard shell into which the animal can pull its head and legs if threatened
- Spawn of the Worm
- Sphinx
- Stone Golem - Construct made of stone that can cast slow spells
- Strangle Weed
- Subterranean Lizard
- Svirneblin
T
V
- Violet Fungus - A purple to gray fungus that resembles a shrieker, attacks with poisonous tentacles
W
- War Dog - Large mastiffs or pit bulls trained to fight, typically armoured in leather
- Water Fiend
- Wild Dog - Roaming packs that compete for food with wolves and refugees
- Will o’ the Wisp - Strange, fey creatures that resemble dancing lights or torches
- Winter Wolf - Dangerous predator that grows about 8 feet long, stands about 4.5 feet at the shoulder, and weighs about 450 pounds
X
- Xorn - An embodiment of the element of Earth that glides through stone
Y
- Yeti - A bipedal ape-like creature averaging 7-9 feet in height and weighing around 300 pounds
1 HD
- Brownie - A small fey being closely related to pixies and sprites, an elf-like creature about 2 feet tall
- Dark Creeper - Short, spindly humanoids with pale skin who wrap themselves in loose, dark clothing
- Drow
- Duergar
- Gas Spore - Strange, non-intelligent fungal creatures that resemble oculus
- Giant Mutant Frog
- Giant Poisonous Frog
- Gullygug
- Hunting Dog
- Leprechaun - The "wee folk" are related to the other fey races of brownies, pixies, and sprites
- Mutoid
- Mycelian
- Piercer - A cone-shaped shelled creature resembling a snail that hunts by dropping from cave ceilings
- Rot Grub - 1-inch long vermin found in carrion, dung, and other organic material
- Svirneblin
2 HD
- Brown Mould - A heat-absorbing fungus that feeds on energy and grows in darkness
- Coffer Corpse - Resembles a zombie, a rotting, fetid corpse of the dead left unburied
- Giant Electric Eel
- Locathath
- Necrophidius - A skeletal giant snake with a fanged skull of an adult human male for a head
- Poisonous Toad
- Poltergeist - Non-corporeal invisible spirits of humans who died tragically or were murdered
- Pseudo-Dragon - Tiny dragons with deadly sting in their tails, lacking breath weapon
- Sahyagin
- War Dog - Large mastiffs or pit bulls trained to fight, typically armoured in leather
- Wild Dog - Roaming packs that compete for food with wolves and refugees
3 HD
- Ankheg - Large insect-like monster with a taste for fresh meat that burrows beneath forests and farmlands
- Aquatic Spider
- Aranea - Intelligent, shape-changing, spider-like creature with magical abilities
- Deep One
- Giant Swordfish
- Sea Hag - A horrible creature that appears as an old crone whose bent shape belies her power and swiftness
- Seahorse, Giant - An actual seahorse which grows almost to the size of a pony
- Strangle Weed
- Triton - Similar to mermen, but larger and significantly more powerful
- Violet Fungus - A purple to gray fungus that resembles a shrieker, attacks with poisonous tentacles
- Water Fiend
4 HD
- Flail Snail
- Ghast - Undead monsters similar to ghouls but smarter and more powerful, surrounded by an overwhelming stench
- Giant Jellyfish
- Giant Pike - Aggressive predators found in larger and deeper lakes
- Giant Wasp - Giant wasps with paralysing poison stingers that carry victims to their nests
- Gibbering Mouther - A horrible creature seemingly drawn from a lunatic's nightmares with the fluid body of an amoeba
- Gorilla
- Hippocampus - The horse of the sea, with a mane that looks like seaweed and a dolphin's tail
- Jackalwere - Strange shapeshifting creatures that can assume jackal or human form
- Merrow
- Peryton - Strange chimerical creature combining the wings, body, and legs of a large bird with the head, neck, and antlers of a deer or stag
- Spawn of the Worm
- Yeti - A bipedal ape-like creature averaging 7-9 feet in height and weighing around 300 pounds
5 HD
- Caryatid Column - Intricately-carved columns in the shape of a person, created as guardians
- Disenchanter - A bizarre creature resembling a cross between a dromedary camel and a cow with a muscular prehensile snout, shimmery electric blue and translucent
- Frost Toad
- Giant Lamprey
- Hook Beast
- Krell
- Phase Spider - A spider able to shift in and out of reality during combat
- Satyr - A creature with the upper half of a man and the lower half of a goat, with red or chestnut brown hair, and jet black hooves and horns
- Slithering Tracker - A transparent slime monster, similar in nature to the gelatinous cube but smaller and more amorphous
6 HD
- Amphisbaena
- Drider
- Leucrocotta
- Mantid
- Nightmare - Otherworldly black warhorse with blood red eyes, fiery nostrils, and burning hooves that serves as a mount for powerful evil beings
- Otyugh - Large creature with 4 legs, 8-foot diameter body, and 3 tentacles behind its mouth
- Snake Person
- Subterranean Lizard
- Will o’ the Wisp - Strange, fey creatures that resemble dancing lights or torches
- Winter Wolf - Dangerous predator that grows about 8 feet long, stands about 4.5 feet at the shoulder, and weighs about 450 pounds
7 HD
- Banshee - Fey undead resembling a colorless, ash-white elf in ragged clothing and chains
- Brass Dragon
- Catoblepas - A fantastically ugly creature with a warthog-like face and body, a long neck, and a powerful tail ending in a bone club
- Flame Lizard
- Rakshasa - Tiger-headed humanoids with backward-curving claws who use illusions to disguise themselves
- Remorhaz - Light blue centipede-like creature that pulses with reddish glow from intense body heat
- Xorn - An embodiment of the element of Earth that glides through stone
8 HD
- Black Hag
- Copper Dragon
- Dragonne - A strange combination of a lion and dragon with brass-colored scales and stiff hair
- Mind Lasher
- Monitor Lizard - Aggressive carnivores found in warm regions with dark grey and black colouration
- Normal Hippopota
- Revenant
- Scorpionoid
9 HD
- Bronze Dragon
- Bulette - Terrifying predator that resembles a gigantic armadillo crossed with a snapping turtle
- Couatl - A powerful and legendary large serpent with feathered wings and shape-changing abilities
- Flash Golem
- Lamia - Upper body of a beautiful woman, lower body of a venomous snake
- Malfyr
- Mimic - A master of deception that can assume the shape of any object or creature
- Shambling Mound - Intelligent plant creatures appearing as piles of rotting vegetation
10 HD
- Behemoth Hippopotamus
- Demonic Knight
- Ettin - Large, nocturnal two-headed creatures that live below ground
- Giant Mantis
- Hulker
- Lurker Above - A subterranean creature resembling a manta ray that swims through the air and drops on prey from ceilings
- Silver Dragon
- Snapping Turtle - Reptiles with a hard shell into which the animal can pull its head and legs if threatened
11 HD
- Clay Golem - Man-shaped figure created from clay by a lawful good cleric
- Eye of Terror
- Lich - An undead former Magic-user or Cleric who used dark magic to prolong its life into undeath
12 HD
- Giant SLug - Large boneless creatures that spit acid and burrow through wood and earth
- 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
- Sphinx
- Trapper - An amorphous ambush predator that lies flat and mimics stone floors
13 HD
- Eye of the Deep - Globular aquatic monster with a massive central eye, two eyestalks, lobster-like pincers, and a gaping maw
14 HD
- Sea Serpent - Serpentine monsters which live in the sea, ranging from 20' to 40' long
- Stone Golem - Construct made of stone that can cast slow spells
18 HD
- Iron Golem - Powerful construct made of iron that can breathe poison gas
20 HD
- Efreeti (Greater)
- Phoenix - A huge, magnificent scarlet-plumed magical bird of surprising intelligence
- Titan - Powerful creatures not native to the material plane that appear as massive humans of unearthly beauty