Transmute Rock to Mud

This spell effects only “natural” stone. Stone which has been created or protected by magic is unaffected, as is stone which has been artificially shaped on all four sides. For example, the walls in a simple tunnel driven through solid rock are subject to this spell, but if the tunnel were lined with brick or stones that had been worked into blocks, a transmute rock to mud spell could not harm them. This spell still is very useful in a siege, however, as virtually all castles must be built upon bedrock in order to support the weight of the walls. It is possible to use a transmute rock to mud spell to undermine a wall by attacking the bedrock underneath, provided that the spell has enough area to reach under the wall and that the mud can flow out and leave a cavity under the wall. In some cases it might be necessary to employ sappers or a dig spell to get at the bedrock and provide a place for the mud to go. If these conditions are met, the wall still remains unaffected if the defender rolls a 10 or more on 1d20.

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