Infusion

The Infusion is an item in Risk of Rain that permanently increases your health by 1 for every enemy you kill. Infusion is best picked up early-game, as it does not work retroactively, only adding health for every kill after receiving the item. It is possible to farm large amounts of health from certain stages, including all stages early-game and in Boar Beach. The increase in max health per kill synchronizes well with as on every kill not only will your maximum health increase but you will also heal. Infusion makes farming more attractive as it increases your chances, even though it can still be time consuming to do so.

Using the Glass artifact, the Infusion item is incredibly useful, as the detrimental effect of Glass reducing your health to 10% of its original only applies to your normal health. Infusion gained health is not cut, allowing the player to get back to normal levels of health and beyond quickly.

Maximum amount of health is 9999. When used with, you can have more than 9999 hitpoints, but only due to the shield. You cannot increase health beyond 9999 via infusion.

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Infusion