Valeska's Lightning Shield

This spell causes the caster to become electrified (doing no harm to himself or his equipment).  The lightning arcs around the caster in random patterns.  Any creature striking the caster deals normal damage, but at the same time the attacker takes 2d4 + 2 / caster level lightning damage.  Reach weapons, such as pikes, do not endanger their users in this way.  If the caster is in a grapple, the other creature(s) int he grapple take lightning damage once per round at the beginning of their turn.