Trogg caster with two Stonevault Rockchewers; interrupt his lightning, control an add, and loot the Shaft of Tsol.
Watch for
Chain LightningInterrupt
3 sec cast that arcs Nature damage from player to player.
Lightning BoltInterrupt
3 sec cast that hits one player for Nature damage.
EnrageCrowd control
Stonevault Rockchewer adds can enrage and hit harder.
Group plan
Tank
Pull Revelosh and any free Rockchewer together. His bolts go to the top threat target, so hold threat firmly and turn the pack away from the healer.
Healer
Stand at max range and apart from others so Chain Lightning arcs less. Expect Nature damage on the tank and anyone near them.
Damage
Control one Rockchewer, then burn Revelosh. Put interrupts on Chain Lightning first. Loot the Shaft of Tsol; it joins the Gni'kiv Medallion to make the staff.
Each class
Druid · your class
In Bear Form, Bash a Chain Lightning cast. Forever lets Entangling Roots work indoors, so root a Rockchewer away from the healer.
Hunter · your class
Lay Freezing Trap before the pull and lead a Rockchewer into it; Forever traps also work in combat. Viper Sting (36) drains his mana.
Mage · your class
Polymorph one Rockchewer before the pull. Save Counterspell for Chain Lightning, the cast that hurts the group most.
Paladin · your class
Hammer of Justice stops a Chain Lightning cast. Run Concentration Aura so his lightning pushes back your heals less.
Priest · your class
Keep Renew on the tank and Power Word: Shield whoever the lightning arcs to. With the Silence talent (30), stop a Chain Lightning.
Rogue · your class
Sap a Rockchewer before the pull; in Forever, Sap no longer breaks Stealth, so you can still open. Kick each Chain Lightning.
Shaman · your class
Earth Shock his Chain Lightning. Grounding Totem (30) near the healer soaks one of his spells every 10 sec.
Warlock · your class
Curse of Tongues slows his casts by 50%. A Felhunter's Spell Lock (36) counters a Chain Lightning; keep it for that cast.
Warrior · your class
Shield Bash or Pummel (38) stops Chain Lightning. Thunder Clap, usable in Defensive Stance in Forever, holds a free Rockchewer.
Level 42 elite · Echomok Cavern, by the back entrance
Optional
Optional golem that can reflect spells and splits off Obsidian Shards at 66% and 33%; physical damage carries the fight.
Watch for
Spell ReflectionStay back
Passive chance to reflect spells cast at it back at the caster.
Summon Obsidian ShardKill adds
At 66% and 33% health he splinters off two non-elite Obsidian Shards.
Splintered ObsidianKill adds
Each splinter lowers the physical damage he deals.
Group plan
Tank
Face him away so melee can hit from behind. Pick up each pair of shards as they spawn at 66% and 33%.
Healer
Heal the tank. His hits are hardest early and weaken each time he splinters.
Damage
Use physical damage or wands; his reflect can return targeted spells. Kill each shard pair, then return to him. He is also immune to DoTs.
Each class
Druid · your class
Fight it in Bear or Cat Form, since targeted spells bounce back. In Bear Form, Swipe hits up to three shards at once.
Hunter · your class
Your shots are physical, so Spell Reflection doesn't touch them. Multi-Shot the shard pairs and Aimed Shot the Sentinel.
Mage · your class
Wand the Sentinel; targeted spells can reflect. Blizzard or Arcane Explosion kills shards. The mage quest Power in Uldaman needs his Obsidian Power Source.
Paladin · your class
Melee it with a Seal up and heal whoever holds the shards. Consecration, trained at 20 in Forever, hits the shards around you.
Priest · your class
Heal and use your wand; Smite and Mind Blast can reflect back at you. Keep Power Word: Shield on whoever picks up shards.
Rogue · your class
Your attacks are physical, so you are the main damage here. Swap to each shard pair at 66% and 33%, then back.
Shaman · your class
Lightning Bolt and shocks can reflect. Melee with Windfury Weapon (30) and use Magma Totem for the shards.
Warlock · your class
Shadow Bolt can reflect into you. Wand the Sentinel, Rain of Fire or Hellfire the shards, and let your Voidwalker melee.
Warrior · your class
Your damage is physical and safe from reflection. Sunder Armor for his high armor; Thunder Clap and Cleave the shards.
Level 47 elite · Khaz'goroth's Seat; three players start him at the altar
Stone watcher who wakes adds all fight and elite adds at 20%; kill the adds as they come, then burn him once the elites wake.
Watch for
Ground TremorStay back
Stuns nearby players for 2 sec; it can come every 5 sec.
Awaken Earthen GuardiansKill adds
5 sec channel that wakes dwarf statues around the room to join the fight.
Awaken Vault WarderKill adds
5 sec cast that wakes elite Vault Warders.
ReconstructKill adds
Earthen Hallshaper adds channel a 20 sec repair that restores 3000 of his health.
WhirlwindStay back
Earthen Guardian adds spin for 2 sec, hitting everyone near them.
Phase 1100–20%
He wakes non-elite earthen adds through the fight, including a group of Earthen Guardians. Kill each add as it wakes, Earthen Hallshapers first, then return to Archaedas.
Phase 220–0%
He wakes elite adds that die when he dies. Ignore them, keep them off the healer, and burn Archaedas.
Group plan
Tank
Pick up adds as they wake and keep Archaedas away from the group. Many groups kite him up the ramps to the columned room. Keep Ground Tremor off casters.
Healer
Spread out of Ground Tremor and pace your mana; it's a long fight. Watch whoever picks up each new add.
Damage
Kill adds as they wake, Earthen Hallshapers first, since Reconstruct heals him. Below 20%, ignore the elite adds and burn Archaedas; they die with him.
Each class
Druid · your class
Innervate (40) the healer in this long fight. In Bear Form, Challenging Roar pulls a wave of awakened adds off the healer.
Hunter · your class
Volley (40) clears clumped dwarf adds. Feign Death if adds stick to you, then go back to Archaedas.
Mage · your class
Blizzard or Arcane Explosion kills the dwarf adds. Hit Earthen Hallshapers first, since their Reconstruct heals the boss.
Paladin · your class
As tank, Consecration grabs the non-elite adds; Forever adds extra threat on its first four targets. Keep Lay on Hands for a spike.
Priest · your class
Pace your mana in this long fight with Renew and lower ranks. Shield the add killers, and Fade if adds turn to you.
Rogue · your class
Swap to an Earthen Hallshaper when it starts Reconstruct, then return to the boss. Below 20%, ignore the elite adds and burn him.
Shaman · your class
Stay outside Ground Tremor. Magma Totem clears the dwarf adds, and Chain Heal (40) covers spread damage.
Warlock · your class
Soulstone the healer before anyone clicks the altar. Send your pet at Earthen Hallshapers so Reconstruct doesn't heal the boss.
Warrior · your class
If your group kites, lead him up the ramps to the columned room. Thunder Clap the dwarf adds; Taunt elites off the healer.