Water Whip

When cast, this spell causes an 8 foot tendril of water to extend from the caster’s hand, which can then be used as a +0 magical whip. When used against creatures who are vulnerable to water, it inflicts an additional 1d6 hit points of damage. Conversely, if a creature is made from water, as in the case of a water elemental, they are immune to it.

The whip gains a +1 magical bonus to hit and damage when the caster reaches 5th level, +2 at 11th level, and +3 at 17th level.