The Auracryst File:Auracryst.svg is a health-storage device that has the shape of a simple green crystal gem. When an Auracryst is equipped to an enemy (bloon/blimp/Darthus,...), said enemy can't be damaged in any way until the Auracryst is destroyed. The Auracryst itself has a whopping 15.000 HP, and can sometimes wander around the track, dealing 20 HP damage to every towers that it cuts. Thus, it's only used by major, really powerful bosses!