What can show up in Great Vault?

[Cognition-norgannon]

Had to go back a couple years to find it, but I guess we have an answer. Don’t know if this has changed, but finally an actual source.

Great Vault Expectations -- First Two Weeks of July

We’ve seen some questions from players who’d like to know specifics about how endgame loot and the Great Vault will operate over the next two weekly resets, so we’ve prepared the following outline. Next Week Following the next weekly reset on July 6 in this region, the Great Vault will offer rewards exactly as it has in previous weeks. Between now and then, defeating raid bosses in Castle Nathria, completing Season 1 Mythic Keystone Dungeons, and earning Honor in rated PvP will generate those …

@Kaivax

As a reminder, you’re only eligible for Great Vault raid loot from bosses that you have previously defeated on the difficulty you’re looking for. For example, you must defeat Heroic Kel’thuzad before his loot will show up as a Heroic quality selection in the Great Vault.