In the Transformers universe, where the Autobots and the Decepticons from all time in space are interlocked in heated warfare, there remains an independent, natural threat that strikes fear in the hearts of even the toughest Transformers. Frequently referred to as Cosmic Rust, this disease threatens to corrode anything it touches, reducing those affected into mere piles of rust. While this is threatening enough as it is, Cosmic Rust becomes even more deadly when those with ill intent learn to weaponize it.
Source：https://www.cbr.com/transformers-have-one-villain/
