As two actions, acidic rain falls to the ground in a cylinder centered on a point within 100 meters. Each creature in the cylinder must make a Fortitude saving throw.
On a failed save, a creature takes 6d6 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 2d6 for each additional mana or psi expended.