To unlock the Terror Zones feature, you must defeat Baal per character, per difficulty using any expansion character—existing characters that have already fulfilled the requirements will automatically have this feature unlocked. Once Ladder Season Two begins, players will need to meet the aforementioned requirements to unlock Terror Zones for their new ladder characters.
List of D2R Terror Zone
Act I
Blood Moor and Den of Evil
Cold Plains and The Cave
Burial Grounds, The Crypt, and the Mausoleum
Stony Field
Dark Wood
The Forgotten Tower
Jail
Cathedral and Catacombs
The Pit
Tristram
Moo Moo Farm
Act II
Sewers
Rocky Waste and Stony Tomb
Dry Hills and Halls of the Dead
Far Oasis
Lost City, Valley of Snakes, and Claw Viper Temple
Arcane Sanctuary
Tal Rasha’s Tombs
Act III
Spider Forest and Spider Cavern
Flayer Jungle and Flayer Dungeon
Kurast Bazaar, Ruined Temple, and Disused Fane
Kurast Sewers
Travincal
Durance of Hate
Act IV
Outer Steppes and Plains of Despair
River of Flame/City of the Damned
Chaos Sanctuary
Act V
Bloody Foothills
Frigid Highlands
Glacial Trail
Crystalline Passage and Frozen River
Arreat Plateau
Nihlathak’s Temple, Halls of Anguish, Halls of Pain, and Halls of Vaught
Ancient’s Way and Icy Cellar
Worldstone Keep, Throne of Destruction, and Worldstone Chamber