Settled areas feature colossal caverns that can be miles on a side, a number of small villages and vaults no more than a day or two travel from each other, and some tunnel patrols from nearby cities or fortresses. Patrols are most often Drow, Illithid Thralls, Duergar, or Derro.
All-consuming hunger
Barghest
Bat, deep (sinister)
Behir
Chitine hunters
Cildabrin
Cloaker
Deepspawn & spawn
Derro bandits
Destrachan
Devourer
Dragon, young adult deep
Dragon, young adult shadow
Drider
Drow merchants
Drow scouts
Drow slavers
Duergar marauders
Ineffable horror
Giant, stone
Gloura
Grimlock hunters
Kuo-toa patrol
Maur
Mind flayer slavers
Minotaur
Mohrg
Ooze, black pudding
Purple worm
Scorpion, giant whip
Spider, giant sun
Spider, giant whip
Spider, Huge monstrous
Spider, subterranean sword
Svirfneblin patrol
Swarm, centipede
Troglodyte war party
Troll
Troll, cave
Umber hulk
Vampire troupe
Vaporighu
Vermin lord
Wraith
Xorn, average