Pressure Sphere

(Stormwrack, DnD 3.5)

Evocation[Water]

Level: ; Druid 2; Sorcerer/Wizard 2; , Blackwater 2
Components: V, S
Casting Time: 1 standard action
Range: Medium (100 ft. + 10 ft./level)
Area: 20-ft.-radius spread
Duration: Instantaneous
Saving Throw: Fortitude half
Spell Resistance: Yes

This spell suddenly causes the water around a target to take on the terrible, bone-crushing pressure of the deepest ocean trenches.
This pressure deals 4d6 points of damage (Fortitude save for half).
The area of the spell can be constrained by the available water; it has no effect on creatures or objects that are within the radius but not in the water, or on squares of water that are not at least 5 feet deep.
The spell must be centered at or below the surface of the water.