Hunter-Killer Negatrix and Hunter-Killer Positrox
Halls of Fabrication
Two verminous fabricants opening the Halls of Fabrication. Kept near each other they form a link that makes both stronger.
Popular builds
The builds groups run most often at this boss, one per role. Ranked by how often each is run, not by damage done.
Most popular Tank build
Warden tank with Pearlescent Ward and Lucent Echoes
seen 6×
Skills
Perfected Pearlescent Ward7 
Perfected Lucent Echoes5 
Cryptcanon Vestments1 
Magma Incarnate1 Most popular Healer build
Arcanist healer
seen 10×
Skills
Master Architect5 Powerful Assault5 
The Blind2 
Perfected Grand Rejuvenation2 Most popular DPS build
Necromancer DPS
seen 49×
Skills
Perfected Slivers of the Null Arca5 
Corpseburster5 
Merciless Charge2 
Slimecraw1 
Velothi Ur-Mage's Amulet1 Most popular Support build
Z'enkosh DragonKnight
seen 23×
Skills
Roar of Alkosh5 
Z'en's Redress5 Perfected Merciless Charge2 Slimecraw1 Velothi Ur-Mage's Amulet1
Ranked by how often a build is run, from the top 100 boss-DPS parses per boss. U50 data, as of 4 Aug 2026.