Life Crystal

A Life Crystal is a consumable item that drops when a Crystal Heart, found in the Underground and Cavern layers, is broken with a pickaxe or drill. When used, it permanently increases the player's health capacity by 20, adding a red heart to the player's health bar, while also restoring 20health. A Life Crystal also has a chance to drop from a Golden or Titanium Crate.

Up to 15 Life Crystals can be used, increasing health capacity by 300 (15hearts). Added to the 100health new players begin with (5hearts), a total of 400health (20hearts) can be achieved. Additional Life Crystals can no longer be used at that point, and attempting to do so will not consume the item. Extra Life Crystals acquired thereafter can be sold for coins, or used to craft Heart Lanterns.

After a world converts to Hardmode, and after the 400health maximum is reached from consuming Life Crystals, Life Fruits can then be used to increase health capacity further, to a maximum of 500 (20Life Fruits).

Trivia

 * Life Crystals can be considered the health counterpart to Mana Crystals.

History
Lebenskristall Cristal de santé 生命水晶