Lost Coffer

Lost Coffer is a Boss relic in Slay the Spire 2 that adds 2 random Ethereal cards to your hand at the start of each combat. These bonus cards provide additional options on your opening turn and can include powerful effects from outside your normal deck.

The Ethereal property means the cards will exhaust at the end of your turn if not played, so they must be used immediately or lost forever. This creates interesting turn-1 decisions about whether to play the random cards or stick with your planned opening. When the random cards are good, they provide a significant power boost on your most important turn.

Lost Coffer is strongest in decks that have the Energy to play extra cards on turn 1, as the Ethereal cards compete with your normal hand for limited Energy. It synergizes with Energy-granting relics and cards, and with strategies that benefit from Exhausting cards (since Ethereal cards naturally Exhaust). The relic's randomness means it is inherently inconsistent, sometimes providing excellent cards and sometimes offering underwhelming ones. For players who enjoy adaptive play and can make the most of whatever they are given, Lost Coffer adds exciting variety to every combat.