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Ulduar

Thorim

Boss #10
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Strategy Guide

FIGHT OVERVIEW
  • The fight has 2 phases. You must clear a corridor/gauntlet to pull Thorim into the main room to start P2.

  • In P1, split your raid in half. While the corridor group that should mostly consist of AoE heavy specs immediately enters the corridor on the left, the other half of the raid stays in the main room.

  • Be careful in the corridor/gauntlet, the last section is trapped, don't walk in the middle.

  • In P2, you fight Thorim himself and don't have to deal with adds anymore.

Hard Mode
  • The Hard Mode for this boss is relatively easy, and is enabled by completing the corridor/gauntlet in less than 2:45 minutes.

  • Sif will be casting different abilities on the raid in P2, but it won't make a massive difference honestly.

Phase 1

Split your raid in half, with AoE heavy specs going in the corridor. Interrupt the Evokers and Acolytes. Do not run in the middle of the room leading up to Thorim at the end of the corridor.

CASTERS

BE SPREAD TO PREVENT

CAST SPEED REDUCTION

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Stormhammer
0.5s Cast

Stuns a random target. It also reduces cast speed by 75% and inflict damage to all friendly players around.

EVERYONE

WATCH HIS ARM

Play Button
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Runic Smash
Dance Mechanic

A blast that passes through the hallway inflicting damage. Watch out for his hands. The hand with a spell effect will cast a blast on its side of the room.

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Charge Orb
Instant Cast

Activate a pillar in the room that will frequently deal light damage to a nearby player.

Dark Rune Acolyte
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Renew
Instant Cast

Dispellable healing spell.

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Greater Heal
2s Cast
Ancient Rune Giant
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Rune Detonation
Instant Cast

A bomb on a random player, rooting them. After 4s, they explode.

Runic Colossus
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Smash
Frontal Cleave

A 10 yards frontal cleave.

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Runic Barrier
Damage Reflect

Reflects arcane damage to the melees. Watch out, don't kill yourself.

Dark Rune Evokers
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Runic Lightning
1.5s Cast

Interruptible light bolt on a random player.

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Runic Mending
2s Cast

Interruptible or purgeable HoT.

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Runic Shield
0.5s Cast

A purgeable absorption shield that reduces physical damage taken by 50%.

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Charge Orb
Instant Cast

Activate a pillar in the room that will frequently deal light damage to a nearby player.

Runic Colossus
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Smash
Frontal Cleave

A 10 yards frontal cleave.

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Runic Barrier
Damage Reflect

Reflects arcane damage to the melees. Watch out, don't kill yourself.

Dark Rune Acolyte
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Renew
Instant Cast

Dispellable healing spell.

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Greater Heal
2s Cast
Dark Rune Evokers
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Runic Lightning
1.5s Cast

Interruptible light bolt on a random player.

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Runic Mending
2s Cast

Interruptible or purgeable HoT.

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Runic Shield
0.5s Cast

A purgeable absorption shield that reduces physical damage taken by 50%.

Ancient Rune Giant
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Rune Detonation
Instant Cast

A bomb on a random player, rooting them. After 4s, they explode.

Phase 2

Thorim is now active and can be killed. Don't stack and rather spread your raid in stacks of 4 to 5 players around the room.

EVERYONE

DON'T STAND NEAR THE LIGHTNING

TO DODGE THE INCOMING AOE

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Lightning Charge
Cone Of Damage

A cone of damage will be created between Thorim and a pillar on the side of the room.


Watch out for the lightning hinting which part of the room will get hit.

EVERYONE

DON'T STAND IN THE BLIZZARD

HARD MODE ONLY
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Blizzard
Instant Cast

An AoE in the room inflicting moderate damage and slowing people.

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Chain Lightning
0.5s Cast

Damage bouncing on nearby players, inflicting 50% more damage for each targets it touches.


This is the reason why you spread in small groups, if it bounces too much, it will end up one shotting players.

HARD MODE ONLY
Sif
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Blizzard
Instant Cast

An AoE in the room inflicting moderate damage and slowing people.

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Frostbolt Volley
Every ~12s

Damage on the whole raid, inflicting constant pressure.


Consider using a Frost Resistance Aura.

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Frost Nova
2.5s Cast

Roots all players nearby for 6 seconds. Try moving out before the casts goes through.

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Unbalancing Strike
Tank Mechanic

Heavy hitting tank ability that reduces defense. Swap tank after each.

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Chain Lightning
0.5s Cast

Damage bouncing on nearby players, inflicting 50% more damage for each targets it touches.


This is the reason why you spread in small groups, if it bounces too much, it will end up one shotting players.

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Unbalancing Strike
Tank Mechanic

Heavy hitting tank ability that reduces defense. Swap tank after each.

HARD MODE ONLY
Sif
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Blizzard
Instant Cast

An AoE in the room inflicting moderate damage and slowing people.

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Frostbolt Volley
Every ~12s

Damage on the whole raid, inflicting constant pressure.


Consider using a Frost Resistance Aura.

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Frost Nova
2.5s Cast

Roots all players nearby for 6 seconds. Try moving out before the casts goes through.

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Thorim
AVAILABLE ANALYSIS
- Tank swap speed
- Blizzard hits
- Lightning Charge damage
- Hard Mode support
- Potions usage & more