From Diablo Wiki
Cultist summoners can be found alone, but are often encountered in circles of five or more individuals, all of whom are working actively to surrender their lives and bodies to a possessing demonic power. Players are well-advised to kill as many of the Vessels as possible, before they can call down a demon and become a more dangerous Activated Vessel.
They have a Thrall Dash which allows them to move very quickly toward you before attacking your with a physical melee attack.
- Unholy Thrall/Dark Vessel
In Alphabetical Order
 Malignant Thrall
 Tormented Thrall
 Unholy Thrall
- Found in Act I - Highlands Cave, Halls of Agony and Leoric's Manor
- Found in Act II - Lair of the Witch
- Manifests from Dark Vessels and Reprobate Vessels
- Physical melee attack
Superunique versions of Thrall have a chance of spawning in the following areas:
The spikes that poke out of their backs are called "Teeth of Diablo", and are indeed a metal spike inserted into the flesh of the willing recipient. The spike does not seem to cause internal haemorrhaging but instead some sort of perverse corruption of both soul and body.
|Monsters of Diablo III Beasts Beasts: Superunique Demons Demons: Superunique Humans Humans: Superunique Undead Undead: Superunique Objects Bosses Boss Mods Monster Info Fanmade|
Bat - Beast - Blood Hawk - Demonic Hellflyer - Electric Eel - Khazra - Lacuni - Lamprey - Quill Fiend - Rockworm - Sand Monster - Sand Shark - Sand Wasp - Scavenger - Spider - Spiderling - Swarm - Withermoth - Wood Wraith -
|Primary Quest Uniques||
Act One Bosses:
Skeleton King -
The Warden -
Strong CC (Limit 1): Knockback -- Nightmarish -- Vortex -- Jailer
|Act One Uniques||Araneae - Web Spit||Leoric - Summon Skeleton, Teleport Strike, Triple Cleave||The Butcher - Smash, Grappling Hook, Spear, Frenzy Charge|
|Act Two Uniques||Maghda - Forcefield, Summoning Ritual, Punish, Moth Dust, Teleport.||Zoltan Kulle - Fiery Boulder, Time Bubble, Ceiling Collapse, Energy Twister,Vanish, Creepy Laugh||Belial - Phase One: Triple Fireball, Summon Vipers. Phase Two: Poison Meteors, Ground Pound, Lightning Strike, Lightning Breath.|
|Act Three Uniques||Ghom - Acid Slime, Sneeze, Gas Cloud, Chomp.||Siegebreaker - Triple Hit, Charge, Leg Stomp, Grab and Throw.||Cydaea - Pain Bolts, Web Trap, Spider Pits.||Azmodan - Bellyflop, Laser Attack, Falling Corpses, Demon Gate, Pool of Destruction, Globe of Annihilation.|
|Act Four Uniques||Rakanoth - Cleave, Teleport Strike, Blade Strike, Volley, Summon Minion.||Izual - Frost Nova, Frozen, Summon Minions.|| Diablo - Phase One: Claw Rip, Charge, Hell Spikes, Shadow Vanish Grab, Curse of Destruction, Ring of Fire, Ground Stomp, Curse of Anguish, Curse of Hatred. |
Phase Two: Shadow Clone. Phase Three: Overdrive, Lightning Breath.