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Master and Commander
Defeat all of the summonable Garrison raid bosses.
Master and Commander requires you to defeat all six summonable Garrison raid bosses, each triggered by a specific invasion type.
Trigger Garrison Invasions
Farm Apexis assault daily quests or purchase a Scouting Missive 
for 
200 Apexis Crystals from Sergeant Crowler at your Garrison to trigger a specific invasion type.
Defeat Teluur — Botani Invasion
Obtain the 
Heart of Oak from a Botani invasion (Lost Veil Anzu or the Everbloom Wilds) and use it to summon and defeat Teluur.
Defeat Mage Lord Gogg'nathog — Ogre Invasion
Obtain the 
Arcane Highmaul Relic from an Ogre invasion (Stonefury Cliffs, Gorian Proving Grounds, or Ring of Blood) and use it to summon and defeat Mage Lord Gogg'nathog.
Defeat Gaur — Goren Invasion
Obtain the 
Runed Greatstone from a Goren invasion (Magnarok or Broken Precipice) and use it to summon and defeat Gaur.
Defeat Commander Dro'gan — Iron Horde Invasion
Obtain the 
Bloodied Iron Horde Banner from an Iron Horde invasion (Mok'gol Watchpost, Iron Siegeworks, the Pit, or Ashran) and use it to summon and defeat Commander Dro'gan.
Defeat Lady Fleshsear — Shadow Council Invasion
Obtain the 
Legion Beacon from a Shadow Council invasion (Shattrath Harbor or Heart of Shattrath) and use it to summon and defeat Lady Fleshsear.
Defeat Annihilon — Shadowmoon Invasion
Obtain the 
Void Prison from a Shadowmoon invasion (Darktide Roost, Pillars of Fate, Skettis, or Socrethar's Rise) and use it to summon and defeat Annihilon.
Use Group Finder for Bosses
The summoning item drop rate from invasions is very low, so searching the Group Finder for active boss summons — particularly for Mage Lord Gogg'nathog, which is the hardest to find — will save significant time.
Tips
Mage Lord Gogg'nathog is the rarest boss to find an active group for; prioritize searching for it specifically in the Group Finder using search terms like 'gogg nathog' or 'ogre invasion boss'.
Alliance players tend to encounter Teluur, Dro'gan, and Annihilon more frequently than the other bosses.
Do not rely solely on farming invasion drops yourself — the drop rate for summoning items is extremely low, and finding existing groups is far more efficient.