As an action, corrosive acid eats away at a creature that you can touch or see within 18 meters. At the start of each of its turns while affected by this spell, it must make a Fortitude saving throw.
On a failed save, it takes 5d4 acid damage.
On a successful save, it takes half as much damage and the effect ends.
You can increase the damage by 6d4 for each additional mana or psi expended.