Players can earn Restored Coffer Keys doing other open world activities, and can use up to four of them a week to increase Delve loot rewards in a rotating set of special ‘bountiful’ Delves.

The Delver's Dirigible is awarded by completing Brann's quest Bountiful Delves in Dornogal, which most people will have completed by the time they defeat Zekvir. You can swap your Dirigible to the ...