Adept Benefit (Mirror)

Your mirror self shatters into punishing shards when damaged. When an enemy adjacent to one of your spaces damages you while your Mirror's Reflection is in effect, you can, as a free action, cause that version of you to explode into mirror shards. This ends Mirror's Reflection (establishing the remaining version of you as the real one) and deals slashing damage to all creatures in a 5-foot emanation around where your mirror self was. The damage is equal to 2 + half your level or the damage of the triggering attack, whichever is lower. You're immune to this damage.