This spell turns natural rock of any sort into an equal volume of mud. The
depth of the mud can never exceed half its length or breadth. If it is cast upon a
rock, for example, the rock affected collapses into mud. Creatures unable to
levitate, fly, or otherwise free themselves from the mud sink at the rate of 10
feet per round and suffocate, except for lightweight creatures that could
normally pass across such ground. Brush thrown atop the mud can support creatures
able to climb on top of it, with the amount of brush required subject to the DM's
discretion. The mud remains until a dispel magic spell or a reverse of this spell, mud to rock, restores its substance--but not necessarily its form. Evaporation turns the
mud to normal dirt, at the rate of 1d6 days per 10 cubic feet. The mud to rock reverse can harden normal mud into soft stone (sandstone or similar mineral)
permanently unless magically changed.
The material components for the spell are clay and water (or sand, lime, and
water for the reverse).
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