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Xenothium (pronounced zi-no-thee-um) is the fictional power supply, specifically an extremely rare and dangerous chemical known to all the Titans (even Starfire despite her alien origin and Raven despite Xenothium's non-mystical nature and lack of connection to herself or her world) for the high-tech suit worn and used by the criminal Red X, granting him a multitude of superhuman abilities capable of taking down multiple superhumans in moments, designed and created by Robin for the suit. Xenothium is used in Masks, X, [[Revved Up] and Titans Together.

It first appears in episode X where Professor Chang also tries to use the unstable element to power a super laser that punches a hole in Titans Tower.

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