wall of stone
Class: mage : 5 monk : 9 oracle : 6 magus : 5 druid : 6 cleric : 5
Syntax: cast CLASS wall of stone on <exit>

This command will cause a wall of rubble to appear on an exit, preventing travel in that direction until all of the rubble has been cleared away. The more powerful the caster, the larger the rubble wall that must be removed.