Null Field: As a free action, the cleric can activate an arcane null field around him with a 10 foot radius. Once in the next round, the cleric can attempt to end or negate the effects of one arcane spell. A roll is made in a similar way to a dispel, where the cleric must roll 2d6 + cleric level + Charisma modifier against 11+caster level of the targeted spell. The cleric must be conscious and aware of the spell in order to negate it.
Thoughts?