Cant do Black Citadel map completion
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Once you complete the Rox — The Hatchery achievement, you can return and the war council will no longer be in session unless you talk to the recap NPC.
ArenaNet Community Team
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You can also get it by going around along the platform to the right. When you get to the end of the platform, get into the corner closest to the POI. That’s how I got it.