As a reaction, which you use when you are hit by an attack, your skin erupts in a swollen, pus-filled bump that bursts open, shooting acid.
Each creature in a cone toward the direction of the attack must make a Reflex saving throw.
On a failed save, a creature takes 2d4 acid damage immediately and additional acid damage equal to half the amount of acid damage dealt at the end of its next turn.
On a successful save, a creature takes half the initial damage and no damage at the end of its next turn.
You can increase the damage by 2d4 for each additional mana or psi expended.