| Adult Red Dragon | Dragon | Huge | Chaotic evil | Mountains, Dungeon, Desert |
| Air Elemental | Elemental | Large | Neutral | Mountains, Plains, Desert |
| Animated Armor | Construct | Medium | Unaligned | Dungeon |
| Ankylosaurus | Beast | Huge | Unaligned | Forest, Mountains |
| Axe Beak | Beast | Large | Unaligned | Forest, Plains |
| Banshee | Undead | Medium | Chaotic evil | Dungeon |
| Basilisk | Monstrosity | Medium | Unaligned | Forest, Mountains |
| Beholder | Aberration | Large | Lawful evil | Dungeon |
| Blink Dog | Fey | Medium | Lawful good | Plains, Dungeon |
| Bugbear | Humanoid | Medium | Chaotic evil | Plains, Dungeon, Mountains |
| Bulette | Monstrosity | Large | Unaligned | Cave, Mountains |
| Centaur | Monstrosity | Large | Neutral good | Plains, Mountains, Forest |
| Chimera | Monstrosity | Large | Chaotic evil | Dungeon, Forest |
| Cloud Giant | Giant | Huge | Neutral | Plains, Mountains, Forest, Desert |
| Cockatrice | Monstrosity | Small | Unaligned | Mountains, Desert, Dungeon |
| Cyclops | Giant | Huge | Chaotic neutral | Mountains, Dungeon, Plains, Forest, Desert |
| Death Dog | Monstrosity | Medium | Neutral evil | Plains, Desert, Dungeon |
| Displacer Beast | Monstrosity | Large | Lawful evil | Plains, Forest, Dungeon |
| Doppelganger | Monstrosity | Medium | Neutral | Mountains, Dungeon, Plains, Forest, Desert, Cave, Beach |
| Duergar | Humanoid | Medium | Lawful evil | Mountains, Dungeon |
| Earth Elemental | Elemental | Large | Neutral | Mountains, Cave, Desert |
| Fire Elemental | Elemental | Large | Neutral | Mountains, Cave, Desert |
| Fire Giant | Giant | Huge | Lawful evil | Dungeon, Mountains, Desert |
| Flameskull | Undead | Tiny | Neutral evil | Dungeon, Mountains, Desert |
| Flesh Golem | Construct | Medium | Neutral | Dungeon, Mountains, Desert |
| Flying Snake | Beast | Tiny | Unaligned | Forest |
| Flying Sword | Construct | Small | Unaligned | Dungeon |
| Frost Giant | Giant | Huge | Neutral evil | Mountains, Cave, Plains |
| Gargoyle | Elemental | Medium | Chaotic evil | Dungeon, Mountains |
| Gelatinous Cube | Ooze | Large | Unaligned | Dungeon, Mountains, Cave |
| Ghost | Undead | Medium | Any alignment | Mountains, Dungeon, Plains, Forest, Desert, Cave, Beach, Ocean |
| Ghoul | Undead | Medium | Chaotic evil | Mountains, Dungeon, Plains, Forest, Desert, Cave, Beach, Ocean |
| Giant Fire Beetle | Beast | Small | Unaligned | Mountains, Cave, Desert |
| Giant Spider | Beast | Large | Unaligned | Forest, Cave, Mountains, Dungeon |
| Gnoll | Humanoid | Medium | Chaotic evil | Dungeon, Cave, Mountains, Plains, Forest |
| Goblin | Humanoid | Small | Neutral evil | Dungeon, Cave, Mountains, Plains, Forest |
| Grick | Monstrosity | Medium | Neutral | Cave, Mountains |
| Griffon | Monstrosity | Large | Unaligned | Mountains, Plains |
| Harpy | Monstrosity | Medium | Chaotic evil | Mountains, Plains, Forest |
| Hill Giant | Giant | Huge | Chaotic evil | Mountains, Plains, Forest |
| Hippogriff | Monstrosity | Large | Unaligned | Mountains, Plains |
| Hobgoblin | Humanoid | Medium | Lawful evil | Dungeon, Cave, Mountains, Plains, Forest |
| Hydra | Monstrosity | Huge | Unaligned | Dungeon, Cave, Mountains, Ocean |
| Kobold | Humanoid | Small | Lawful evil | Dungeon, Cave, Mountains, Plains, Forest |
| Kuo-toa | Humanoid | Medium | Neutral evil | Beach, Ocean |
| Lich | Undead | Medium | Any evil alignment | Dungeon |
| Lizardfolk | Humanoid | Medium | Neutral | Forest |
| Manticore | Monstrosity | Large | Lawful evil | Dungeon |
| Medusa | Monstrosity | Medium | Lawful evil | Dungeon |
| Merfolk | Humanoid | Medium | Neutral | Beach, Ocean |
| Mind Flayer | Aberration | Medium | Lawful evil | Dungeon |
| Minotaur | Monstrosity | Large | Chaotic evil | Dungeon |
| Mummy | Undead | Medium | Lawful evil | Dungeon |
| Nothic | Aberration | Medium | Neutral evil | Dungeon |
| Ochre Jelly | Ooze | Large | Unaligned | Dungeon, Cave, Plains, Forest |
| Ogre | Giant | Large | Chaotic evil | Plains, Forest, Mountains |
| Orc | Humanoid | Medium | Chaotic evil | Plains, Forest, Mountains, Desert |
| Owlbear | Monstrosity | Large | Unaligned | Plains, Forest, Mountains |
| Pegasus | Celestial | Large | Chaotic good | Plains, Forest, Mountains |
| Phase Spider | Monstrosity | Large | Unaligned | Cave, Dungeon |
| Plesiosaurus | Beast | Large | Unaligned | Ocean |
| Quipper | Beast | Tiny | Unaligned | Ocean |
| Rust Monster | Monstrosity | Medium | Unaligned | Cave, Mountains, Desert |
| Satyr | Fey | Medium | Chaotic neutral | Forest |
| Spectator | Aberration | Medium | Lawful neutral | Dungeon |
| Stirge | Beast | Tiny | Unaligned | Dungeon, Cave, Mountains, Desert |
| Stone Giant | Giant | Huge | Neutral | Mountains, Cave |
| Stone Golem | Construct | Large | Unaligned | Mountains, Cave, Desert |
| Storm Giant | Giant | Huge | Chaotic good | Mountains, Desert |
| Tarrasque | Monstrosity | Gargantuan | Unaligned | Mountains, Dungeon, Plains, Forest, Desert, Cave |
| Troll | Giant | Large | Chaotic evil | Mountains, Plains, Forest, Cave |
| Twig Blight | Plant | Small | Neutral evil | Forest |
| Umber Hulk | Monstrosity | Large | Chaotic evil | Dungeon, Cave |
| Water Elemental | Elemental | Large | Neutral | Beach, Ocean |
| Werebear | Humanoid | Medium | Neutral good | Mountains, Plains, Forest, Cave |
| Wereboar | Humanoid | Medium | Neutral evil | Plains, Forest, Cave |
| Wererat | Humanoid | Medium | Lawful evil | Plains, Forest, Cave |
| Weretiger | Humanoid | Medium | Neutral | Plains, Forest, Cave |
| Werewolf | Humanoid | Medium | Chaotic evil | Mountains, Plains, Forest, Cave, Dungeon |
| Wight | Undead | Medium | Neutral evil | Dungeon |
| Winter Wolf | Monstrosity | Large | Neutral evil | Mountains, Cave, Forest |
| Worg | Monstrosity | Large | Neutral evil | Mountains, Cave, Forest |
| Wyvern | Dragon | Large | Unaligned | Mountains, Cave, Plains |
| Yeti | Monstrosity | Large | Chaotic evil | Mountains, Cave |
| Young Green Dragon | Dragon | Large | Lawful evil | Mountains, Cave, Forest, Plains |
| Yuan-ti Abomination | Monstrosity | Large | Neutral evil | Forest, Plains |
| Yuan-ti Malison | Monstrosity | Medium | Neutral evil | Forest, Plains |
| Yuan-ti Pureblood | Humanoid | Medium | Neutral evil | Forest, Plains |
| Zombie | Undead | Medium | Neutral evil | Mountains, Dungeon, Plains, Forest, Desert, Cave, Beach, Ocean |