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Used to purchase unique enhancements after acquiring a Trials Passage. Use the Trials Passage to see available purchases.
― In-game description

A Passage Coin is a material that can be used to purchase buffs on a Trials Passage during the Trials of Osiris. Passage Coins can be obtained from losing matches in the Trials of Osiris and from completing a match in the daily Crucible playlist once per day.