Underdark (Lowerdark) Desolate Area Encounter Table
Desolate areas are wild caves and tunnels that are not settled and generally do not support much in the way of wildlife or monsters. Much of the Lowerdark is desolate.
Aboleth
Aboleth slaver brood
Annihilator
Avolakia
Behir
Beholder
Beholderkin (deathkiss or gouger)
Bodak
Cloaker mob
Cloaker, shadowcloak elder
Cockroach, giant
Deepspawn brood
Delver
Desmodu
Dragon, mature adult deep
Dragon, mature adult copper
Dragon, very old black
Dragon, mature adult red
Dragon, mature adult shadow
Drow patrol
Duergar raiders
Earth Glider
Elder eidolon
Fiendwurm
Fomorian
Giant, stone
Gloura
Grimlock hunters
Gray render
Illithidae (any)
Kuo-tao war party
Lurker
Lurking strangler
Maur
Mind flayer (or slavers)
Mohrg
Nightshade (nightwing or nightwalker)
Ooze, elder black pudding
Phaerimm
Psurlon, elder
Purple worm
Roper
Roper, urophion
Rukarazyll
Shaboath (waters)
Spider, wraith
Stone flyer
Susurrus
Swarm, swamp strider (near lakes & rivers)
Teratomorph (usually in or near water)
Tomb tapper
Tunnel terror
Umber hulk, truly horrid
Underdark landwyrm
Wraith, dread wraith
Xorn, elder
Yrthak