This spell turns natural, uncut or unworked rock of any sort
into an equal volume of mud. If the spell is cast upon a boulder,
for example, the boulder collapses into mud. Magical or enchanted
stone is not affected by the spell. The depth of the mud created
cannot exceed 10 feet. Creatures unable to levitate, fly, or
otherwise free themselves from the mud sink until hip- or
chest-deep, reducing their speed to 5 feet and giving them
2 penalties on attack rolls and AC. Brush thrown atop the
mud can support creatures able to climb on top of it. Creatures
large enough to walk on the bottom can wade through the area at a
speed of 5 feet.
If transmute rock to mud is cast upon the ceiling of a cavern
or tunnel, the mud falls to the floor and spreads out in a pool
at a depth of 5 feet. For example, a 10th-level caster could
convert twenty 10-foot cubes into mud. Pooling on the floor, this
mud would cover an area of forty 10-foot squares to a depth of 5
feet. The falling mud and the ensuing cave-in deal 8d6 points of
damage to anyone caught directly beneath the area, or half damage
to those who succeed at Reflex saves.
Castles and large stone buildings are generally immune to the
effects of the spell, since transmute rock to mud cant
affect worked stone and doesnt reach deep enough to
undermine such buildings foundations. However, small
buildings or structures often rest upon foundations shallow
enough to be damaged or even partially toppled by this spell.
The mud remains until a successful dispel magic or transmute
mud to rock spell restores its substancebut not necessarily
its form. Evaporation turns the mud to normal dirt over a period
of days. The exact time depends on exposure to the sun, wind, and
normal drainage.
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