Acid Rain (3.5e Spell)

You create a storm of acid rain centered around a center point that you designate. This storm deals 2d6 points of acid damage to every creature inside (against which there is no saving throw) at the end of each combat round (starting with the round in which the spell was cast).

The acid rain produced by this spell also degrades weapons and armor caught within, causing them to incur a cumulative -4 penalty to their base damage (for weapons) or a -1 penalty to their Armor Class bonus (in the case of armor and shields) per round of exposure to the rain. Magical items are allowed a Fortitude save each round against the damage. On a nonmagical item, if the penalty to damage is greater than or equal to the maximum base damage the weapon could deal (ex. 12 damage on a greatsword) or if the penalty to Armor Class equals 0, the item is destroyed. If a shield can also be used as a weapon, use whatever value will allow it to last the longest. Magical items reverse the damage on their own, restoring the effects of one round of damage each hour. Non-magical items do not restore themselves in this way, and must be replaced or reforged.