Magic:Mestils Acid Sheath

Conjuration [ Acid ]
Level: Sor/Wiz 5
Innate Level: 5
Component(s): V, S
Casting Time: 1 action
Range: Personal
Target: Caster
Duration: 1 Round/Level
Counter(s): --
Saving Throw: None
Spell Resistance: No
Metamagic: Extend, Quicken, Silent, Still
Energy Substitution: Yes

The spell creates an acid shield around your person. Any creature striking you with its body does normal damage, but at the same time the attacker takes 1d6 points +1 per caster level of acid damage.