Crystal (constitution)

The Crystal (constitution) is a type of lava crystal that spawns throughout the Fight Kiln minigame after completing waves 11, 23, and 35. It can only be used in this minigame and disappears after leaving. This crystal boosts your life points for 3.5 minutes and leaves you with full life points after it wears off.

At level 99 constitution, it turns the user's life points to 22,200 out of 14,800.