Zyraphim
The Destroyer
In the graphic novel, a Life Crystal heals the protagonist, and I thought it would be a nice addition to the game. Life Crystals would fully heal you, but Life Fruit would heal only 150 health. They would replenish health only when your max health increases, so Crystals won't work if you already have max red hearts, and Fruit won't work when you have max gold hearts. Because of their rarity and the fact that you can only use Crystals 15 times and Fruit 20 times, they won't trigger Potion Sickness.