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Mogg-Saron
Collect any class armor set from Ulduar.
Mogg-Saron requires you to collect any complete class armor set (Tier 8) from Ulduar, earned by gathering five token pieces dropped by bosses throughout the raid.
Identify Your Token Group
Your class determines which token type you need: Paladins, Priests, and Warlocks collect Conqueror tokens; Warriors, Hunters, and Shaman collect Protector tokens; Rogues, Mages, Druids, and Death Knights collect Vanquisher tokens.
Farm the Helm Token
The 
helm token drops from Mimiron on 10-man or Thorim on 25-man. Enter Ulduar at max level and defeat the relevant boss for your difficulty.
Farm the Glove Token
The 
glove token drops from Freya on 10-man or Mimiron on 25-man. Glove tokens may also drop from Emalon the Storm Warden outside of Ulduar.
Farm the Leg Token
The 
leg token drops from Hodir on 10-man or Freya on 25-man. Leg tokens may also drop from Emalon the Storm Warden as an alternative source.
Farm the Shoulder Token
The 
shoulder token drops from Thorim on 10-man or Yogg-Saron on 25-man. Defeat the appropriate boss during your Ulduar run.
Farm the Chest Token
The 
chest token drops from Yogg-Saron on 10-man or Hodir on 25-man. Defeat the appropriate boss to complete your five-piece token collection.
Turn In Tokens
As of patch 7.2, clicking a token automatically creates the item based on your loot specialization without visiting a vendor. Alternatively, token turn-ins are available in Northrend's Dalaran at the appropriate armor crafting vendor for your armor type — plate at the Blacksmith, cloth at Threads of Fate, and so on.
Clear Bags Before Claiming Achievement
If the achievement does not trigger after completing the set, remove any items from your bags that are still eligible to be sold back to a vendor, as unsold returnable items can prevent collection achievements from proccing — deleting or finalizing those items has been confirmed to resolve this.
Tips
Ulduar 10 and 25 have been merged, so tokens of both item levels (219 and 226) can drop in the same run, allowing you to complete the set faster without needing separate difficulty lockouts.