Diablo II/Undead

Abyss Knight

 * Act IV
 * City of the Damned
 * River of Flame

Undead Soul Killer

 * Act III
 * Swampy Pit Level 1
 * Swampy Pit Level 2
 * Swampy Pit Level 3
 * Sewers Level 1
 * Sewers Level 2

Undead Stygian Doll

 * Act III
 * Swampy Pit Level 1
 * Swampy Pit Level 2
 * Swampy Pit Level 3
 * Durance of Hate Level 1
 * Durance of Hate Level 2

Undead Flayer

 * Act III
 * Flayer Dungeon Level 1
 * Flayer Dungeon Level 2
 * Flayer Dungeon Level 3

Doom Knight

 * Act IV
 * Outer Steppes
 * Plains of Despair
 * Chaos Sanctuary

Doom Caster

 * Act IV
 * Outer Steppes
 * Plains of Despair

Strangler

 * Act IV
 * City of the Damned
 * River of Flame

Storm Caster

 * Act IV
 * Chaos Sanctuary

Hollow One

 * Act II
 * Halls of the Dead Level 1
 * Halls of the Dead Level 2
 * Halls of the Dead Level 3

Guardian

 * Act II
 * Claw Viper Temple Level 1
 * Claw Viper Temple Level 2

Unraveler

 * Act II
 * Tal Rasha's Tomb

Horadrim Ancient

 * Act III
 * Sewers Level 1
 * Sewers Level 2

Dried Corpse

 * Act II
 * Sewers Level 1
 * Sewers Level 2
 * Sewers Level 3
 * Halls of the Dead Level 1
 * Halls of the Dead Level 2
 * Claw Viper Temple Level 1
 * Tal Rasha's Tomb

Decayed

 * Act II
 * Stony Tomb Level 2
 * Halls of the Dead Level 1
 * Halls of the Dead Level 2
 * Halls of the Dead Level 3

Embalmed

 * Act II
 * Ancient Tunnels
 * Claw Viper Temple Level 1
 * Claw Viper Temple Level 2

Preserved Dead

 * Act II
 * Tal Rasha's Tomb
 * Act III
 * Swampy Pit Level 1
 * Sewers Level 1
 * Sewers Level 2

Cadaver

 * Act III
 * Durance of Hate Level 1
 * Durance of Hate Level 2

Oblivion Knight

 * Act IV
 * Chaos Sanctuary

Skeleton

 * Act 1
 * Cave Level 1
 * Cave Level 2
 * Burial Grounds
 * Crypt
 * Mausoleum
 * Stony Field

Returned

 * Act I
 * Tristram
 * Black Marsh
 * Act II
 * Halls of the Dead Level 1
 * Halls of the Dead Level 2
 * Halls of the Dead Level 3

Bone Warrior

 * Act I
 * Pit Level 1
 * Pit Level 2
 * Act II
 * Claw Viper Temple Level 1
 * Claw Viper Temple Level 2

Burning Dead

 * Act II
 * Sewers Level 1
 * Sewers Level 2
 * Sewers Level 3
 * Tal Rasha's Tomb

Horror

 * Act II
 * Sewers Level 3
 * Stony Tomb Level 1
 * Stony Tomb Level 2
 * Act III
 * Sewers Level 1
 * Sewers Level 2

Skeleton Archer

 * Act I
 * Tristram
 * Underground Passage Level 1
 * Underground Passage Level 2
 * Dark Wood

Returned Archer

 * Act I
 * Tamoe Highland
 * Monastery Gate

Bone Archer

 * Act I
 * Barracks
 * Jail Level 1
 * Jail Level 2
 * Jail Level 3

Burning Dead Archer

 * Act II
 * Sewers Level 1
 * Sewers Level 2

Horror Archer

 * Act II
 * Harem Level 2
 * Palace Cellar Level 1
 * Palace Cellar Level 2
 * Palace Cellar Level 3

Returned Mage

 * Act I
 * Tamoe Highland (Fire)
 * Monastery Gate (Lightning)

Bone Mage

 * Act I
 * Barracks (Fire)
 * Jail Level 1 (Fire)
 * Jail Level 2 (Fire)
 * Jail Level 3 (Lightning)
 * Inner Cloister (Lightning)

Burning Dead Mage

 * Act II
 * Sewers Level 3 (Fire, Lightning and Poison)
 * Stony Tomb Level 1 (Lightning)
 * Stony Tomb Level 2 (Poison)

Horror Mage

 * Act II
 * Sewers Level 3 (Fire and Cold)
 * Ancient Tunnels (Lightning)
 * Harem Level 2 (Cold)
 * Palace Cellar Level 1 (Fire)
 * Palace Cellar Level 2 (Poison)
 * Palace Cellar Level 3 (Lightning)

Banished

 * Act I
 * Catacombs Level 3

Ghoul Lord

 * Act II
 * Arcane Sanctuary
 * Tal Rasha's Tomb

Night Lord

 * Act III
 * Ruined Temple
 * Disused Fane
 * Forgotten Reliquary
 * Travincal

Dark Lord

 * Act III
 * Durance of Hate Level 1
 * Durance of Hate Level 2

Blood Lord

 * Act III
 * Durance of Hate Level 3

Undead Scavenger

 * Act II
 * Dry Hills
 * Far Oasis

Gloam

 * Act III
 * Great Marsh
 * Swampy Pit Level 1
 * Swampy Pit Level 2
 * Swampy Pit Level 3

Burning Soul

 * Act IV
 * Plains of Despair

Wraith

 * Act I
 * Jail Level 1
 * Jail Level 2
 * Jail Level 3
 * Cathedral

Ghost

 * Act I
 * Tower Cellar Level 1
 * Tower Cellar Level 2
 * Tower Cellar Level 3
 * Tower Cellar Level 4
 * Tower Cellar Level 5

Specter

 * Act II
 * Arcane Sanctuary

Apparition

 * Act II
 * Tal Rasha's Tomb

Dark Shape

 * Act III
 * Flayer Dungeon Level 1
 * Flayer Dungeon Level 2
 * Flayer Dungeon Level 3

Zombie

 * Act I
 * Blood Moor
 * Den of Evil

Hungry Dead

 * Act I
 * Cave Level 1
 * Cave Level 2
 * Burial Grounds
 * Crypt
 * Mausoleum
 * Stony Field

Ghoul

 * Act I
 * Catacombs Level 3
 * Catacombs Level 4

Plague Bearer

 * Act II
 * Lost City
 * Ancient Tunnels

Drowned Carcass

 * Act III
 * Great Marsh
 * Swampy Pit Level 2