Prisms are used by Tricksters. When the ability is used, you teleport to the location of your cursor when activated. A decoy appears where you were before the activation, and walks towards the way you were moving, causing enemies to attack it, if it's close enough. If you stand still before you use the prism, the decoy moves in a random direction. Since the decoy is an illusion to the enemies, their shots still pass through.