Restored Coffer Key are used to open Bountiful Coffer at the end of a Bountiful Delve. Bountiful Coffer drop a variety of rewards, but among them are more powerful gear drops, reaching all the way up to Hero track gear. Maximum gear rewards come from a Tier 8 Bountiful Delve, which is not available at this time.
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Do Not Use Restored Coffer Keys Until Season 1 if Optimizing Gear
With Bountiful Delves being capped at Tier 3 until Season 1, players are strongly advised to save their Restored Coffer Keys until Season 1 of The War Within.
