ESO Quick Mechanics
Trial · 12 players · Vvardenfell · Morrowind Chapter (2017)

Halls of Fabrication

VetModerateHMChallenging

Sotha Sil's factory under Vvardenfell. Five bosses: the Hunter-Killers, Pinnacle Factotum, Archcustodian, the Refabrication Committee (3 bosses) and the Assembly General.

01

Hunter-Killer Positrox & Negatrix

Boss
☠ Wipe mechanic
  • Interrupt Taking Aim. Spheres snipe a random player for a one-shot. Everyone interrupts; don't rely on one assigned person.
  • Keep the two bosses apart. Close together they link with a beam and both enrage.
  • Kill them close together. When one dies, the survivor enrages. Bring both to ~20%, then finish one and burn the other.
  • Purge Poison Injection fast: a ramping DoT from the spheres on random players.

Split 6/6 (tank, healer, 4 DPS per boss), burn both in parallel and kill them close together.

Tank
  • One tank per boss, each facing away. Block the lunge (heavy) or you're pinned; if pinned, someone interrupts that boss.
  • Stay close to your boss, or it leaps to you (Rending Leap).
  • Tail whip: shock balls roll out behind the boss. Block them or step into the gaps.
DPS
  • Shalk adds (75/50/25% combined health) can't be taunted. AoE them.
Healer
  • Stack the group in the middle between the bosses. Purge Poison Injection on several people at once.
👁 Watch for
  • Bosses: two large kagouti-like fabricants.
  • Spheres: dwarven spheres on circular pads with a big bubble shield. Taking Aim is a long channelled shot.
  • Enrage link: a lightning beam between the two bosses.
↯ Alternatives
  • High DPS: skip kiters: since Update 25 the cascades don't stun.
  • High DPS: mostly ignore the spheres: burn the bosses.
  • Low DPS fallback: kill the spheres. Priority: Shalks > spheres > bosses. Bring the bosses together briefly to beam a sphere's shield off, then split them again right away.
More detail
Not fully confirmed:
  • Execute: Xynode says get both to ~20% then about 1M each before killing one; Fextralife says Positrox to ~20% then switch to Negatrix. Both agree: kill them close together.
02

Pinnacle Factotum

Boss
☠ Wipe mechanic
  • Simulacra (from 75%): Factotum vanishes and 4 shades circle the tank. Each turns solid in turn; the tank blocks facing the solid one. Everyone stays out of the tank's front.
  • Centurion steam: its cone stacks Scalding (heavy healing reduction). Step out of the cones and kill it fast.
  • Spinning Centurion (from 40%): it spins at its target and one-shots non-tanks. Kill it or have the OT kite it in a wide circle.
» Burn strat
DPS check 58k Vet per DPS · Kill before upstairs
  • Skip upstairs: kill him before Divayth calls 'fabricants powering up'.
  • Top groups did this in 2020, before his health was nerfed.
  • Nuke groups kill Centurions on the boss before they steam.
  • If 'fabricants powering up' is called, do upstairs (fallback below); failing it wipes the group.
Tank
  • MT: boss in the center (or far corner for newer groups), facing away. Block the staff smash; it sparks onto the group.
  • OT: pick up Centurions and kite the spinning one.
DPS
  • Conduits (from ~60–70%): kill immediately. They drain resources and hit hard.
  • Interrupt Direct Current (beams linking ~4 players with red circles that grow under them).
Healer
  • Meteors (Unstable Energy) land on spread players during the upstairs phase. Don't stack; three hits can kill.
👁 Watch for
  • Upstairs timer: starts about every 90s; portals glow at the sides of the room.
  • Shades: 4 ghostly copies of the Factotum around the tank, with the tank spot green and the rest of the floor red.
  • Centurion: a big dwarven centurion venting steam in front/back, then sides.
↯ Alternatives
  • Low DPS fallback: upstairs portals. 4 players go up through the side portals, kill 4 spheres (stand behind each to expose its shield), then press all 4 consoles at the same time. 60s or the group wipes. Don't drop down early.
More detail

There's no enrage or special execute. Mechanics from 40% onward just repeat. Most wipes come from a failed upstairs (timer) or the spinning Centurion getting into the group.

Not fully confirmed:
  • How much DPS skips upstairs today isn't documented. Xynode says the timer runs ~90s from the start or from the last successful upstairs.
  • Conduit start: 60% per eso-mechanics and Xynode, 70% per Fextralife.
03

Tunnels & Reprocessing Yard

Trash
☠ Wipe mechanic
  • Calefactors: their frontal cone can one-shoot. Face them away.
  • Ruptured Centurion: tank faces it away. When nearly dead it revives the Arquebuses, so kill those after.
Tank
  • Turn Centurions and Calefactors away from the group.
DPS
  • Interrupt Shock Barrage on the Arquebus spheres.
Healer
  • Capacitors' ranged AoE hits hard and drains magicka. Spread a little.
👁 Watch for
  • Shock Pylons: posts that toggle on and off. Walk past when they're off; a hit slows and drains magicka.
More detail
Not fully confirmed:
  • Trash details come mostly from eso-mechanics. Other guides skip the trash.
04

Archcustodian

Boss
☠ Wipe mechanic
  • Never touch it while shielded. The shield kills on contact and reflects projectiles.
  • Shock pylons: pull the lever to arm a pylon trap, and walk the spider into it. That drops its shield and stuns it (~15s). It's the only damage window.
  • Adds (Calefactors / Desiccators): 2 spawn after each stun. Calefactor cones can one-shoot; keep them facing away. Desiccators pull players in. Kill both before the next stun; adds near the shielded boss gain shields.
Tank
  • It ignores taunt and just walks. One tank handles the adds; the other works the levers.
DPS
  • Stand in front of it as it walks. Anyone too far away gets hit by its long-range shots.
  • Dots up right before the stun, burst during it.
Healer
  • Spinning blade traps stack bleeds. Stand on the side with the slower blade track; the center of the pad shapes is safe.
👁 Watch for
  • Archcustodian: a giant dwarven spider with a glowing bubble shield.
  • Blades: whirring saw blades moving along tracks in the floor.
More detail

Each lever press makes the spider walk faster when it gets up. The vet achievement asks for six or fewer pylons without missing a stun, which shows the target pace.

Not fully confirmed:
  • High DPS likely kills it in very few stuns. No current source gives a count.
05

Refabrication Committee

Boss
☠ Wipe mechanic
  • Keep the three apart except at the thresholds. Linked beams between them hit very hard.
  • Overheat/overload tank swap: stacking bubbles on the tanks. 10 stacks from the same boss kills that tank, so swap Reducer/Reactor before then.
  • Ruined Factotums (bombers): they walk to the Reclaimer, power up, then charge and explode on a random player. Kill them before they reach the middle.
  • Enraged Reducer's heavy one-shots. At ~70/40/20% each boss goes invulnerable and enrages; bring all three together to stun them and remove it.
Tank
  • Reducer (left): block/dodge the heavy. Reactor (right): block the heavy, stay out of the Grasping Limbs claws.
  • Reclaimer stays in the center. Tank the other two in a triangle around it.
DPS
  • Stop damage just above each threshold so all three hit it together.
  • Execute (<20%): split for good. Kill the Reclaimer first to stop bombers, then the other two.
  • Someone calls out each Factotum summon.
Healer
  • Purge the Reducer's burn (Fire Whirl / flame bursts) quickly.
👁 Watch for
  • Bomber summon: shock balls landing around the arena edge.
  • Execute: Factotums spawn around the edge and the arena shrinks.
More detail
Not fully confirmed:
  • Modern skips: no current source says groups skip the tank swap or the bombers. Early 2017 clears ignored the bombers, but by 2020 everyone killed them (Code65536).
  • Thresholds: eso-mechanics says 69/39/19%, Fextralife 70/40/20%, Xynode ~71/41/27%. Treat as roughly 70/40/20.
06

Assembly General

Final boss
☠ Wipe mechanic
  • Stomp: the tank blocks, and gets back in range fast. If the tank is too far, he slams (Quake) and knocks the whole group down. 3 slams in a row wipes the group.
  • Recharge at 85/65/45%: he goes to the center, shields and reflects all damage. Stop attacking. Destroy the 4 terminals (each one left alive makes his big hit stronger). Poison rises from the vents and upper platforms are electrified.
  • Toxic Coolant pools at the corridor ends behind him and spreads along the edges when he moves. Don't stand in it.
  • Execute (25%): he moves to the center. Corridors fill with gas and only the center square is safe. Seeker rockets hit everyone, and each death makes them hit harder.
Tank
  • MT: stay in front of him and block the stomp. Titanic Smash knocks you far back: run straight back before he slams.
  • OT: pick up the paired adds (Calefactors under the right arm, Capacitors under the left) at 90/87, 70/67, 50/47, 30/27%.
DPS
  • Tactical Facsimiles: each player death spawns a copy using that player's skills. Kill it fast.
  • Stop damage when an arm is about to fall (~3% above each recharge) and clear adds first, so mechanics don't overlap.
Healer
  • Group hides on the ledge under the flame (Enkindling) arm; the saw arm can't reach there.
  • Bombard meteors land on several players. Don't overlap them.
👁 Watch for
  • Assembly General: a giant dwarven construct with a saw-blade arm and a flamethrower arm.
  • Stomp: he raises his left foot.
  • Terminals: 4 consoles appearing at the arena ends during recharge.
Hard mode · veteran only

Activate: Reset the circuit breaker before pulling the Assembly General (veteran). It empowers him.

  • More health and damage (UESP lists ~108M HM vs ~86M vet).
  • Calefactors and Capacitors spawn more often. Plan the OT and add burns around it.
More detail

He walks the corridors in a set pattern and returns to the center at 85, 65, 45 and 25%. Each arm falls off at its threshold and leaves a stump that sparks, with adds spawning. Survival beats DPS in execute: deaths ramp the rockets.

Not fully confirmed:
  • Circuit breaker location: sources confirm the 'reset the circuit breaker' trigger (UESP achievements) but none fetched gives its exact spot.
  • HM changes: Xynode says just more health and 'a couple more adds'; the add increase comes from old PTS patch notes. Other sources give no HM details.
  • High DPS likely trivializes HM now. Plausible, but unconfirmed.
  • Stomp wipe: eso-mechanics says 3 unblocked stomps kill the player; Xynode says 3 double-stomps kill the group.
Sources · last checked 2026-11-10