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Ulduar

Thorim Guide

Thorim in Ulduar, quoted from the Adventure Guide. Database holds the raw abilities and the full loot table.

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30-second TL;DR

Adventure Guide says

  • Thorim calls in Dark Rune forces to engage players that are in the Arena until allies are able to reach Thorim by traveling through the Hallway.
  • Once players reach Thorim he will leap into the arena and use powerful Lightning attacks to defeat his foes.
  • Stages named in the Adventure Guide: Stage One: Prove Your Worth, The Arena, The Hallway, Stage Two: Keeper of Storms, Hard Mode.
  • Tanks: Avoid Thorim's Lightning Charge once Stage Two begins.
  • Healers: Avoid Thorim's Lightning Charge once Stage Two begins.
  • Damage dealers: While in the Arena interrupt the Dark Rune Acolyte's Greater Heal and the Runic Mending cast by Dark Rune Evokers.

Overview

Adventure Guide says

Thorim calls in Dark Rune forces to engage players that are in the Arena until allies are able to reach Thorim by traveling through the Hallway. Once players reach Thorim he will leap into the arena and use powerful Lightning attacks to defeat his foes.

  • Avoid Thorim's Lightning Charge once Stage Two begins.
  • While in the Hallway avoidRunic Smash cast by the Runic Colossus.
  • While in the Hallway avoidSmash cast by the Runic Colossus once it is engaged.
  • Take turns tanking Thorim to manage Unbalancing Strike.

Encounter phases

Adventure Guide says

  1. Stage One: Prove Your Worth Thorim calls in Dark Rune forces to engage players that are in the Arena until allies are able to reach Thorim by traveling through the Hallway.
  2. The Arena
  3. The Hallway
  4. Stage Two: Keeper of Storms
  5. Hard Mode If players traverse the Hallway quick enough and reach Thorim within 90 seconds Sif will join the battle in Stage Two.

Tank mechanics

Adventure Guide says

  • Avoid Thorim's Lightning Charge once Stage Two begins.
  • While in the Hallway avoidRunic Smash cast by the Runic Colossus.
  • While in the Hallway avoidSmash cast by the Runic Colossus once it is engaged.
  • Take turns tanking Thorim to manage Unbalancing Strike.

Healer mechanics

Adventure Guide says

DPS mechanics

Adventure Guide says

Boss abilities

AbilityAdventure GuideNotes
Stormhammer
Deafening Thunder
Charge Orb
Chain Lightning
Lightning Charge
Unbalancing Strike
Frostbolt Volley
Frost Nova
Blizzard
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Loot

Every name is a TheWoWDB item page. Hover the row for the first-party tooltip.

Fragment of Val'anyrBelt of the BetrayedNBelt of the BetrayedTWBelt of the Blood PitNBelt of the Blood PitTWCombatant's BootbladeNCombatant's BootbladeTWConqueror's Aegis FaceguardTWConqueror's Circlet of SanctificationTWConqueror's Darkruned FaceguardTWConqueror's Deathbringer HoodTWConqueror's Glaivedancer HelmetTWConqueror's Kirin Tor HoodTWConqueror's Nightsong CoverTWConqueror's Scourgestalker HeadpieceTWConqueror's Siegebreaker GreathelmTWConqueror's Steelfist HelmetTWConqueror's Terrorblade HelmetTWConqueror's Worldbreaker HelmTWCrown of the Wayward ConquerorNCrown of the Wayward ProtectorNCrown of the Wayward VanquisherNEmbrace of the GladiatorNEmbrace of the GladiatorTWFate's ClutchNGauntlets of the Thunder GodNGauntlets of the Thunder GodTWGuise of the Midgard SerpentNGuise of the Midgard SerpentTWHandwraps of ResonanceNHandwraps of ResonanceTWLegacy of ThunderNLegacy of ThunderTWLeggings of Lost LoveNLeggings of Lost LoveTWLeggings of Unstable DischargeNLeggings of Unstable DischargeTWMjolnir RunestoneNMjolnir RunestoneTWPauldrons of the CombatantNPauldrons of the CombatantTWPendant of the Shallow GraveNScale of FatesNScale of FatesTWSif's PromiseNSif's RemembranceNSif's RemembranceTWSkyforge CrossbowNSkyforge CrossbowTWSpaulders of the Wayward ConquerorNSpaulders of the Wayward ProtectorNSpaulders of the Wayward VanquisherNValorous Aegis ShoulderguardsTWValorous Darkruned ShoulderplatesTWValorous Deathbringer ShoulderpadsTWValorous Glaivedancer PauldronsTWValorous Kirin Tor ShoulderpadsTWValorous Nightsong MantleTWValorous Scourgestalker SpauldersTWValorous Shoulderpads of SanctificationTWValorous Siegebreaker PauldronsTWValorous Steelfist PauldronsTWValorous Terrorblade PauldronsTWValorous Worldbreaker ShoulderpadsTWVulmir, the Northern TempestNVulmir, the Northern TempestTWWarhelm of the ChampionNWarhelm of the ChampionTWWisdom's HoldNWisdom's HoldTWIllusion: Blade WardRuned Orb

Mounts, toys, achievements, transmog

Only rows the journal loot table or an achievement title can prove for this encounter.

Mounts

Mimiron's Head

Entrance and instance

Ulduar is a raid in the Adventure Guide. See the Ulduar database page for the raw journal, map, and loot grid. This guide does not invent coordinates or a walking path.

Flame Leviathan
Ignis the Furnace Master
Razorscale
XT-002 Deconstructor
The Assembly of Iron
Kologarn
Auriaya
Hodir
Freya
Mimiron
General Vezax
Yogg-Saron
Algalon the Observer

Player strategy

This page quotes the Adventure Guide. It does not add player strategy such as positioning, assignments, stack or spread calls, or cooldown timings unless that sentence is already in the journal.

Questions

What does the Adventure Guide say about Thorim?

Thorim calls in Dark Rune forces to engage players that are in the Arena until allies are able to reach Thorim by traveling through the Hallway.

How many abilities does Thorim have?

The current datamine lists 9 named abilities on the Thorim encounter.

What does Thorim drop?

The Adventure Guide lists 72 drops. Each name links to its TheWoWDB item page. The full table also lives on the Ulduar database page.

Does Thorim change on Heroic or Mythic?

The current Adventure Guide text for this encounter does not include separate Heroic or Mythic sentences we can quote. If a later client build adds them, they appear here automatically.

Does Thorim drop a mount?

The journal loot table includes Mimiron's Head. Each links to its TheWoWDB mount page.

Where does this guide's text come from?

Quoted Adventure Guide sections come from TheWoWDB's retail datamine (client build 12.1.0.69587, ingested 2026-09-01). Player strategy such as positioning, assignments, and cooldown timings is omitted unless that sentence is already in the journal.

Source and build

This page quotes the Adventure Guide. It does not add player strategy such as positioning, assignments, stack or spread calls, or cooldown timings unless that sentence is already in the journal. Quoted sections come from TheWoWDB Adventure Guide datamine (client build 12.1.0.69587, ingested 2026-09-01). Ability names link to first-party spell pages. When a newer retail build is ingested, this page updates with it.