What the achievement asks
Complete the four key-driven encounters at the Obsidian Citadel. Five points, account-wide.
The four
| Event | Whose bar | Keys to fill it | What happens |
|---|---|---|---|
| Clearing the Vault | Wrathion | 20 | The rare Shas'ith becomes attackable |
| Death's Shadow | Sabellian | 20 | The rare Death's Shadow spawns |
| Breaking the World | Igys the Believer | 10 | The rare Morchok spawns |
| Forging the Answer | Forgemaster Bazentus | 10 | You take a forged weapon and clear mobs with it |
Anyone's keys fill the bar
Each of the four carries a bar showing how many keys have been handed in, and every player's keys count towards it. A busy Citadel starts these events without you contributing a single fragment.
That changes what this achievement actually is. It is not a farm, it is a matter of being present when a bar fills. If the Citadel is quiet, your own keys from Obsidian Keymaster will get there in time, and spreading your thirty keys across all four rather than dumping them on one keeps every bar moving together.
Do all four in one session
Progress on this achievement has a long history of resetting when you log out. Players report going from three of four back to zero after a relog, sometimes hours later.
Treat it as a single sitting. Build up keys across as many days as you like, but complete the four events without logging out, hearthing to a different continent or letting the game phase you.
Two more failures worth recognising so you do not waste an evening on them. The event sometimes does not start even after the bar fills, most often reported straight after picking up the weapon during Forging the Answer. And the game occasionally phases you into another layer mid-event, which simply removes the event from around you. Neither is something you did: leave, come back, and fill the bar again.
Where it fits
One of eleven under Flight Club, a piece of A World Awoken. Three of the four events end in a rare that also counts for Adventurer of the Waking Shores, so check that branch before you leave.