Fairy in a Bottle

Fairy in a Bottle is a rare potion with a unique passive trigger: rather than being used actively, it activates automatically when you would die, healing you to 30% of your maximum HP instead. This effectively provides a one-time death prevention, keeping you alive through what would have been a killing blow. It is obtained through enemy drops, shop purchases, or events.

Fairy in a Bottle is arguably the most insurance-providing potion in the game. Because it activates passively upon death, it gives you a safety net without requiring active decision-making — you simply hold it and it functions as a form of extra life. The heal to 30% max HP can be substantial if you've built up your HP pool via relics or events. It is particularly valuable in late-game runs where a single mistake can end the run, providing breathing room against difficult bosses or unexpected spike damage. The main strategic consideration is that holding it occupies a potion slot that could be used for more active potions, so it is most valuable when you're playing on low HP or anticipate a difficult fight ahead.