Transmute Water to Dust

When this spell is cast, the subject area instantly undergoes a change from liquid to powdery dust. 

Note that if the water is already muddy, the area of effect will be expanded to double normal, while if wet mud is concerned the area of effect will be quadrupled. 

If water remains in contact with the transmuted dust, the former will quickly permeate the latter, turning the dust into silty mud if a sufficient quantity of water exists to do so, otherwise soaking or dampening the dust accordingly.

Only liquid actually existing in the area of effect at the moment of spell casting is affected. Liquids which are only partially water will be affected insofar as the actual water is concerned, except that potions which contain water as a component part will be rendered useless.

Living creatures are unaffected, except for those native to the Elemental Plane of Water. Such creatures receive a saving throw versus Spell to escape the effect, and only one such creature can be affected by any single casting of this spell, regardless of the creature's size or the size of the spell's area of effect.

The reverse of the spell is simply a very high-powered create water spell which requires a pinch of normal dust as an additional material component.

For either usage of the spell, other components required are diamond dust of at least 500 gp value, a bit of seashell, and the druid's mistletoe.

This spell is identical to the 6th-level druid spell of the same name, except as noted above. 

The magic-user does not need mistletoe as a material component.