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The 'Rust promoter is an item found in EarthBound which deals damage to mechanical enemies. However, it doesn't work on Starmen, despite them being at least partially mechanical in nature. Rust Promoters can be purchased at Burglin Park in Twoson, from a junk salesman in Fourside, and behind the drugstores in Threed and Dusty Dunes Desert. One each can be found in Saturn Valley and in the Fourside's sewers. Breaks after one use.

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