ESO Quick Mechanics
Trial · 12 players · Solstice (vault in Coldharbour) · Seasons of the Worm Cult, Part 1 (2025)

Ossein Cage

VetHardHMVery hard

Mannimarco's vault in Coldharbour, where you destroy the Dolorous Cista. Three bosses (Shapers of Flesh, Jynorah & Skorkhif, Overfiend Kazpian) plus optional side bosses behind Dreadful Portals. Most fights send a team through Carrion Portals.

01

Shapers of Flesh

Boss
☠ Wipe mechanic
  • Fleshspawns (small red blobs): never let two merge, or they form a Flesh Abomination. Immobilize and burn each blob as it lands.
  • Killing an Abomination spawns 2 more blobs (3 on HM). Kill the new blobs before you go back to the Shaper, or it snowballs.
  • Harvester: Soul Cremation one-shots non-tanks; dodge it. Its blue fire-wave cleave nukes a DPS, so face it away. It's interruptible.
  • Effluvial Expellant: a large AoE. Block it (or roll/barrier) and heal the lingering DoT.
Tank
  • MT: taunt every new Abomination right away and face its swipes and slam away. The slam leaves a growing plague pool.
  • Pull blobs together with chains so they die one at a time, without merging.
  • OT: pick up the Harvester and block or dodge its heavy.
DPS
  • Priority: small blobs > Harvester > Abominations > Shaper. Pushing only the Shaper is how runs fail.
  • Portal team (1 healer + 3 DPS): kill the Channeler inside to drop the big Shaper's shield, then the Harvester and Abomination that spawn. Call when it's nearly done so the MT can reposition.
Healer
  • Watch Caustic Carrion stacks on the portal team.
👁 Watch for
  • Shapers: six fleshy Voriplasm-like masses that act as one boss.
  • Fleshspawn: a small red blob flung through the air. Abomination: a big flesh golem with a ground-slam plague pool.
Hard mode · veteran only

Activate: Challenge banner before the fight.

  • Abomination kills drop 3 blobs instead of 2 (forum reports).
  • Caustic Carrion ramps faster. Everything has more health.
More detail

Blob spawns follow Shaper damage and Abomination kills. Two blobs can land on the same spot and make an Abomination instantly, which is RNG you just have to react to. The last quarter spawns blobs much faster, so stay calm and keep the priority. EtD says that on vet the portal can wait until the adds are clear.

Not fully confirmed:
  • The HM blob count comes from forum players, not a guide.
02

Jynorah and Skorkhif

Boss
☠ Wipe mechanic
  • Keep the bosses apart, but not too far. If they get too close, one teleports away and starts a flame-spitting attack that can wipe even on vet.
  • Sparking / Blazing Curse: a curse circle drops on players. Move out, and cross-heal: the curse cuts healing, so healers cover the other group.
  • Titanic Clash (at health thresholds): you're moved to the titan platforms and the two titans, Sparkstorm Myrinax and Blazeforged Valneer, fight. The loser's side takes heavy damage. Afterward, jump down on the correct exit side.
  • Enfeeblement colors (blue = Sparking, red = Blazing) decide which portal and which Heat Ray or Seeking Flames you handle.
Tank
  • Jynorah (lightning, blue) and Skorkhif (fire, red): one tank each. Both stomp waves of flame in 4 directions and slam their staff to drop a curse circle. Step out of it.
  • Hold them where DPS can hit both but they're outside teleport range.
DPS
  • Spectral adds on the platforms throw flame waves. Point them away.
  • On vet you can split the group to kill the Channelers on the platforms.
Healer
  • Use Vigor, Radiating Regen or Combat Prayer for coverage while cursed.
👁 Watch for
  • Two Xivkyn torturers: Jynorah with blue storm magic and Skorkhif with red fire.
  • Titans: two giant chained Daedric beasts on upper platforms, one blue and one red.
Hard mode · veteran only

Activate: Challenge banner before the fight.

  • Heat Ray: Sparking and Blazing aspects fire an unblockable ray. It's stacked onto players of the matching Enfeeblement color; mitigate and heal it.
  • Seeking Flames from the atronachs target players of the matching Enfeeblement color.
  • Reflective Scales: don't hit the titans.
  • Curses never despawn in execute. You eventually run out of space, so burn the last 20–30% fast.
  • Extra adds on the upper platforms near the titans. Bosses have more health.
More detail

PTS notes say Clash damage hits the loser harder on vet and that the platform gets superheated a short time after one boss dies. Kill them close together. Using a Carrion Portal heals you, and on HM it extends Enfeeblement to its maximum duration.

Not fully confirmed:
  • Heat Ray handling (who stacks where) and Reflective Scales come from addon feature names and PTS notes. No guide explains them fully.
  • Titanic Clash thresholds aren't published, and PTS changed them several times.
03

Side bosses (Dreadful Portals)

Secret boss

How to spawn: Optional. Each one is in a secret area (Inscrutable Lichyard, Gaol of Transition, Sitient Lair) reached through a Dreadful Portal. EtD says you open it by killing a watcher. Tanks go through first.

☠ Wipe mechanic
  • Red Witch Gedna Relvel: her Spectres channel a group wipe. Interrupt and focus them. During the Phantasm split, dodge when the phantasms start casting projectiles.
  • Blood Drinker Thisa: stack and burn. Watch for adds carrying orbs; she flies often.
  • Tortured Ranyu (with Tortured Amkaos and Kathutet): fire targets players and can blow up walls.
Tank
    DPS
    • Kill orb-holding small adds to reset Carrion stacks. Keep stacks at about 5 or fewer.
    Healer
      More detail
      Not fully confirmed:
      • Exact portal locations and triggers: Fextralife names the areas, and EtD says 'kill a watcher'. I couldn't confirm either.
      04

      Overfiend Kazpian

      Final boss
      ☠ Wipe mechanic
      • Never let Kazpian stand near his summoned allies. He enrages. Keep him on one side of the bridge and the miniboss on the other.
      • Torturous Chains: two players get chained together. Red tether = too close (one or both die). Keep a safe distance; one player stays put while the other walks the chain through a Giant Sword to cut it.
      • Agonizer Bombs: two blue orbs cross the arena. Pick one up and carry it to the edge, or it explodes into a large DoT.
      • Giant Swords land in the arena and fire cones periodically. Don't stand in front of them.
      • Portal phases: a team goes to the side platform and kills the Channelers. Return as a group when the bridge collapses. Anyone left on the Channeler platform is bombarded with meteors.
      • Jumping off the platform kills you.
      Tank
      • Cross swipe combo (swipe, swipe, then a cross swipe with a cone): swap tanks after Frenzy. Taking it head-on leaves a big debuff; rolling it is fine.
      • Vile Leap: he jumps to his target. The enraged version is bigger.
      • OT: pick up each familiar foe: Low Warden Dusk, Molag Kena, King Khrogo, the Ossein Colossus.
      DPS
      • Kill orb-carrying skeletons first in each phase (Carrion reset), then the summoned boss, then Kazpian.
      • King Khrogo's Incinerator banner spawns Simulacrums. Interrupt them, or stack the bosses on the banner to remove it.
      • Molag Kena is guarded by shades, and her rotating lightning line can be rolled. The last portal drops constant meteors.
      Healer
      • Raised spinning swords put a heal-debuff circle on several players. Spread them out but stay in healer range.
      • Biting Blaze: AoEs spawn about a second after the cast. Get the group out.
      👁 Watch for
      • Kazpian: a huge Ruinach brute with giant swords, channeling on the Dolorous Cista.
      • Chain: a visible tether between two players. Red is too close, yellow/amber is OK, green means it snaps when one player reaches a sword.
      • Agonizer Bomb: a blue orb rolling across the arena.
      Hard mode · veteran only

      Activate: Challenge banner before the fight.

      • More health on Kazpian, Low Warden Dusk, Molag Kena, King Khrogo and the Channelers.
      • Caustic Carrion ramps up much faster, so portal teams must reset stacks often.
      • Completing HM drops the Shattered Horn of the Overfiend.
      More detail

      Each portal phase adds another Channeler and summons a familiar foe from the Cista. The fight moves between platforms as his health drops. Taunting during Frenzy no longer enrages him (fixed on PTS). Forum players say HM gets very punishing in execute.

      Not fully confirmed:
      • Agonizer Bombs: EtD says they're roaming orbs you carry to the edge; Fextralife says a bomb is placed on a player who must leave the group. Both say move it away from the stack.
      • Chain on vet/HM: a forum player says crossing the chain does nothing on normal. What happens on vet/HM isn't confirmed, so don't cross it.
      • Phase health thresholds aren't published. The addon shows a countdown to the next portal phase.
      Sources · last checked 2026-11-09