5e SRD >Spells >

Rusting Grasp

3rd-level transmutation

Casting Time: 1 bonus action
Range: Self
Components: V, S, M (a scale or antenna from a rust monster)
Duration: Concentration, up to 1 minute

Your touch corrodes a nonmagical ferrous metal object. If the object isn’t being worn or carried, your touch destroys a one-foot cube of it. If the object is being worn or carried by a creature, make a melee spell attack against the creature. If the object touched is either metal armor or a metal shield being worn or carried, its takes a permanent and cumulative –1 penalty to the AC it offers. Armor reduced to an AC of 10 or a shield that drops to a +0 bonus is destroyed. If the object touched is a held metal weapon, the weapon takes a permanent and cumulative –1 penalty to damage rolls. If its penalty drops to –5, the weapon is destroyed.

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Tome of Alchemy, © 2020, Necromancer Games; Author Courtney Campbell, Matt Finch