Diablo II: Lord of Destruction/Demon

Afflicted

 * Drifter Cavern
 * Ancients' Way

Blunderbore

 * Frigid Highlands

Mauler

 * Pit of Acheron

Vile Archer

 * Frigid Highlands

Dark Archer

 * Crystalline Passage
 * Drifter Cavern
 * Matron's Den
 * Matron's Den

Vile Lancer

 * Frigid Highlands

Dark Lancer

 * Frozen River
 * Ancients' Way

Black Lancer

 * Worldstone Keep Level 1
 * Matron's Den
 * Furnace of Pain
 * Furnace of Pain

Demon Imp

 * Bloody Foothills
 * Frigid Highlands
 * Abaddon
 * Arreat Plateau
 * Pit of Acheron
 * Frozen Tundra

Demon Gremlin

 * Frigid Highlands
 * Arreat Plateau

Demon Rascal

 * Frozen Tundra

Demon Trickster

 * Infernal Pit
 * Furnace of Pain
 * Furnace of Pain

Demon Sprite

 * Worldstone Keep Level 3

Dark One

 * Abaddon

Carver

 * Arreat Plateau
 * Ancients' Way

Devilkin

 * Halls of Anguish

Dark Shaman

 * Abaddon

Carver Shaman

 * Arreat Plateau
 * Ancients' Way

Devilkin Shaman

 * Halls of Anguish

Flayer

 * Halls of Anguish
 * Halls of Vaught

Soul Killer

 * Worldstone Keep Level 1
 * Worldstone Keep Level 2

Flayer

 * Halls of Pain
 * Halls of Vaught

Stygian Doll

 * Infernal Pit

Soul Killer

 * Worldstone Keep Level 1
 * Worldstone Keep Level 3

Flayer Shaman

 * Halls of Vaught

Soul Killer Shaman

 * Worldstone Keep Level 1

Flesh Hunter

 * Matron's Den
 * Matron's Den

Frenzied Hell Spawn

 * Arreat Plateau

Night Clan

 * Arreat Plateau
 * Drifter Cavern

Hell Clan

 * Pit of Acheron

Blood Clan

 * Halls of Pain

Death Clan

 * Frozen Tundra

Hell Spawn

 * Arreat Plateau
 * Frozen Tundra

Maw Fiend

 * Pit of Acheron

Balrog

 * Abaddon
 * Pit of Acheron
 * Infernal Pit

Pit Lord

 * Throne of Destruction
 * Furnace of Pain
 * Tristram
 * Tristram

Overseer

 * Bloody Foothills

Lasher

 * Frigid Highlands

Hell Whip

 * Arreat Plateau

Blood Boss

 * Infernal Pit
 * Worldstone Keep Level 3

Menace Worm

 * Halls of Vaught
 * Worldstone Keep Level 1

Anguish Worm

 * Worldstone Keep Level 3

Wretched Defiler

 * Halls of Vaught

Fetid Defiler

 * Worldstone Keep Level 1

Rancid Defiler

 * Worldstone Keep Level 3

Hell Witch

 * Abaddon
 * Infernal Pit
 * Throne of Destruction

Siren

 * Frozen River
 * Icy Cellar

Vile Witch

 * Worldstone Keep Level 1
 * Matron's Den
 * Matron's Den

Succubus

 * Crystalline Passage
 * Frozen River
 * Drifter Cavern

Hell Temptress

 * Abaddon
 * Pit of Acheron
 * Halls of Vaught
 * Icy Cellar
 * Worldstone Keep Level 3
 * Matron's Den
 * Matron's Den

Blood Temptress

 * Frozen Tundra

Grotesque Wyrm

 * Halls of Pain

Flesh Beast

 * Worldstone Keep Level 1

Grotesque

 * Halls of Pain

Flesh Spawner

 * Worldstone Keep Level 1