This spell turns natural rock of any sort into an equal volume of mud. The depth of the mud can never exceed one-half its length and/ or breadth. If it is cast upon a rock, for example, the rock affected will collapse into mud. Creatures unable to levitate, fly, or otherwise free themselves from the mud will sink and suffocate, save for lightweight creatures which could normally pass across such ground. The mud will remain until a dispel magic spell or a reverse of this spell, mud to rock, restores its substance — but not necessarily its form. Evaporation will turn the mud to normal dirt, from 1 to 6 days per cubic 1” being required. The exact time depends on exposure to sun, wind and normal drainage. The mud to rock reverse will harden normal mud into soft stone (sandstone or similar mineral) permanently unless magically changed.