You're able to transform your blast into an explosion like that of a grenade.
EXP Cost: 4 EXP
Benefit(s): As a full-round action you can transform your blast into a burst instead of a single target effect. This turns the attack into a 4 square radius burst within the blast's normal range, and those not within the epicenter where the blast initially hit take 1/2 damage (or 1/4 damage on a failed hit). The person in the epicenter takes full damage (or half on a miss).