Acid Sheath

Conjuration (Creation) [Acid]
Level: Sorcerer/wizard 5
Components: V, S, M, F
Casting Time: 1 standard action
Range: Personal
Target: You
Duration: 1 round/level (D)
You crush the fire ants between your fingers
and rub the smashed mixture over your
exposed flesh. The smashed ants liquefy,
and the liquid covers your body in a thick,
translucent sheath.
You enclose yourself in a fluid sheath
of acid that does not harm you. You can
breathe normally and cast spells while
the acid sheath is present. Any creature
striking you deals normal damage, but
at the same time the attacker takes 2
points of acid damage per caster level
(maximum 30 points). Reach weapons,
such as longspears, do not endanger
their users in this way. The acid sheath
does not protect you against other
attack forms, such as fire.
If you are in a grapple, other creatures
in the grapple takes acid damage
once per round at the beginning of
their turn.
Any spell you cast with the acid descriptor
while the sheath surrounds
you deals an extra 1 point of damage
per die.
Material Component: A handful of fire
ants (alive or dead).
Focus: A glass sculpture of a humanoid
(worth 50 gp).