The Guild Vault was a planned feature to implement shortly after the release of Factions. It was to be a buyable Guild hall service from the Guild Lord to store the guild's common items, but apparently dropped due to a server issue . In an excerpt of a Gamespot article Designer James Phinney mentioned the Factions' Guild hall services and the plan to integrate the vault into the game:
Important services, such as a Xunlai storage agent and a priest of Balthazar, will be moderately priced, while other, more esoteric services will be priced as luxuries. Among the most anticipated, I'm sure, will be a vault keeper who maintains storage space for the whole guild. This is an entirely new feature that we're adding soon after the release of Factions.
— James Phinney
|Guild Vault||?||Item storage for the guild's common property.|