|Release date||14 February 2012 (Update)|
|Alchemy||Cannot be alchemised|
|Store price||Not sold|
|Examine||This crystal will increase your Constitution. Lasts for 3.5 minutes.|
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 to 15000 for 3.5 minutes and leaves you with full life points after it wears off.