Blood Orange

The Blood Orange is a craftable Hardmode permanent power-up item that increases the player's maximum life, as an extension to Life Fruits. There are 3 other items that function identically to this: the Miracle Fruit, the Elderberry, and the Dragonfruit. It is the first of these to be obtainable following boss progression. It can only be used once, and after that the player must use one of the remaining fruit to increase their maximum life. With all of these, the player's maximum life is capped at 600.

Trivia

 * In real life, blood orange is a variety of orange with crimson, almost blood-colored flesh.