Demon's Bane

Any demon inside this symbol's area takes 1-8 points of damage every round until it gets out. The effect lasts 5-20 minutes. The Devil's Bane and Spirit's Bane symbols work the same way against their own targets.

As a Symbol of Power, it is traced by hand, wand or staff, goes off when anyone but its caster sees or encounters it, reaches no more than 20 ft. in radius, and stays in place until a counter-symbol or a successful counter-spell (50% per try) removes it.