Celestial / Cosmic
When Kai's Patron nominated him, he brought with him a Vault Key, which allowed him to travel to and summon items from an extradimensional vault that gets bigger the more full it is. Now that that happened, Vaults of the same style exist in the Static Map. Then his patron stopped paying Nexus.
THIS TYPE OF BULLSHIT IS WHY ALL PLAYERS MUST CHOOSE INTERESTING ITEMS FOR ALL NEW CHARACTER APPLICATIONS!