Upon using this spell, the caster may select a number of creatures equal to his proficiency bonus. These creatures must succeed on a Dexterity Saving Throw, or a corrosion process of any non-magical ferrous metal that the target is wearing or carrying, will begin.
Each round that the caster uses his action to maintain the concentration of this spell, any non-magical ferrous metal objects that the target carries or wears, will corrode further, carrying a permanent and cumulative -1 penalty to the AC that it offers(if any), or any damage rolls that it makes(if any). Upon reaching a -5 penalty, the armor, weapon, or item(s) are destroyed. If concentration is broken, the damage-over-time effect of corrosion will cease immediately, any accumulated penalty up until that point will remain permanently.
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