All week, open Group Finder (default hotkey: i) and then select Dungeon Finder to queue for any Legion dungeon on Normal or Heroic difficulty. Alternately, get a group of veteran dungeoneers together and travel to one of the Legion dungeons on Mythic difficulty.
Look for the following all week long:
- Archmage Timear near Violet Hold in Dalaran has a quest for you. Or, if you forget to pick it up there, you can start it from within the Adventure Journal.
- Quest requirement: Complete 4 Legion dungeons on Mythic difficulty.
- Rewards: One loot box containing a piece of gear from Heroic difficulty Antorus.
- Passive bonus: The final boss in each dungeon drop additional loot on all difficulties (except Mythic Keystone difficulties).