This spell provides a subject with a better resistance to acid, corrosives, and caustic substances of all kinds. Mild corrosives cannot harm the subject at all, although they can still damage his gear. More intense acids and corrosives (black dragon breath, Melf's acid arrow, and the natural attacks of various puddings, oozes, slimes, and jellies) inflict only half the normal damage on the protected character. If the attack requires a Iron Vigil Resist Acid and Corrosion saving throw, the subject gains a +3 bonus, sustaining half damage with a failed save or one-quarter damage with a successful saving throw.
Notes: Uncommon for clerics (PO:SM).