What is Fairy in a Bottle?
Revives the character from lethal HP loss once while kept in the potion slot.
This reference covers gameplay decisions in the original Slay the Spire. Character-specific options and relic synergy can change how useful an item is, so consider your current deck, health, upcoming enemy and available resources before applying a strategy.
When and how to use it
Keep a slot available if you expect dangerous boss encounters.
What to avoid
The potion occupies limited capacity and does not help against all forms of failure.