Riptide.
Generates a tide-like wave of force.
Evocation [Force]
Level: Drd 2, Sor/Wiz 2
Components: V, S, M
Casting Time: 1 action
Range: Close (25 ft. + 5ft./2 levels)
Target, Effect or Area: Cone (up to one target / caster level)
Duration: Instantaneous
Saving Throw: Special (see text)
Spell Resistance: Yes
Description
The forsaken elves are not known for their creative impulses, but this spell was fashioned by one of their seafaring mages, a privateer and sea witch by the name of El-Edrell. He would use its magic to repel hostile boarders (or passengers who had overstayed their welcome, it is rumored) by washing them off of their feet and sweeping them overboard.
Spell Effect
When this spell is invoked, it creates a wave of blue-green force that sweeps all in the affected area from their feet. The effect is treated as a Trip attempt on each affected target, with no roll required of the caster. Each target rolls to retain their footing, making resistance checks against Strength or Dexterity, whichever is better, against the DC of the spell (not the casters Strength score). The tide is treated as a Medium-sized creature for purposes of modifiers to this roll, and a target with 4 or more legs, or otherwise superior stability over the human form (such as an ooze) gains a +4 stability modifier to this check.
Subjects affected by this spell do not gain an attack of opportunity to trip the caster if they succeed in retaining their footing, although the spellcasting itself may provoke a standard attack of opportunity normally.
Arcane Material Components: A pint of seawater that is poured out in the direction of the spells area of effect.