All Beyond the Yonder Seas and Streams
4-level Transmutation
You bestow a curse upon a 30-foot cube within range, eating away metal within the area. Each object thinner than 3 inches in any dimension made of metal within the area is destroyed (including nonmagical shields, weapons, and ammunition). Objects that aren't completely destroyed by the spell become coated with a layer of rust. Each nonmagical suit of medium or heavy armor made of metal within the area instead takes a permanent -5 penalty to the AC it offers. If the penalty reduces the armor's AC to 10 or lower, it is destroyed. Otherwise, the armor seizes at the joints, and a creature wearing it becomes restrained. A creature restrained by the armor can use its action to make a Strength check against your spell save DC, freeing itself on a success.
Objects made of silver, gold, platinum, mithril, and adamantine are unaffected by this spell.
When you cast this spell using a spell slot of 5th level or higher, you target an additional 30-foot cube for each slot level above 4th. Each cube must have at least one face adjacent to the face of another cube, and must originate from a point within range.
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