Large Capsule

Large Capsule is a Boss relic in Slay the Spire 2 that adds a random Rare card to your deck upon pickup. Rare cards are among the most powerful cards in the game, and obtaining one for free as a bonus effect of a Boss relic pickup can significantly boost your deck's power level.

The value of Large Capsule depends heavily on which Rare card you receive. Some Rare cards are build-defining powerhouses that can single-handedly carry a run, while others may not fit your current strategy at all. The randomness means you cannot plan around what you will get, but the floor of a free Rare card is generally high enough to make this a worthwhile pickup.

Large Capsule is best when taken early, as you have more fights remaining to leverage the new Rare card. It pairs well with upgrade effects that can enhance the Rare card further. The relic provides a one-time benefit with no ongoing effect, which means it competes with Boss relics that provide sustained value like Energy bonuses. For runs that need a power injection rather than incremental improvement, Large Capsule can provide exactly the card you need to take your deck to the next level.