As two actions, swarming, biting locusts fill a sphere centered on a point within 20 meters. The sphere spreads around corners. The sphere remains for the duration, and its area is lightly obscured. The sphere’s area is difficult terrain.
When the area appears, each creature in it must make a Fortitude saving throw. A creature takes 4d4 piercing damage on a failed save, or half as much damage on a successful one. A creature must also make this saving throw when it enters the spell’s area for the first time on a turn or ends its turn there.
You can increase the damage by 1d4 for each additional mana or psi expended.