Lower Water

Using this spell the caster lowers the level of the water in a river, a lake, or even the sea by up to 2 feet per caster level for the given duration, but to no less than 1 inch deep. The spell affects an area with radius of at most 10 feet per level centered on the caster's chosen location (within the range given). There will be a steep slope up to the surface of any area of un-lowered water that falls outside the spell's radius. Ships which were already in the area of effect as well as any that dare to enter it will be unable to climb the slope and thus unable to leave the area (if not outright beached by the spell in the first place). This spell has the effect of slow (the reverse of haste) when cast upon water elementals and other creatures formed from water; a save vs. Spells is allowed, with success negating the effect. It cannot be cast upon any other kind of creatures.