Crystal Heart

Crystal Hearts are background objects that drop one Life Crystal each when broken with a pickaxe, drill, or explosives. They can be found naturally placed in any area Underground and below, though they are fairly uncommon.

Life Crystals are used to increase a player's health capacity by 1 red heart, or 20 health. It also heals you by the same amount on use. Health capacity cannot be increased using Life Crystals once the player already has a capacity of 400 health, at which point only Life Fruit can further increase it to 500. Life Crystals can still be used thereafter in crafting Heart Lanterns.

History
Cœur de Cristal