Transmogrification Seal

The Transmogrification Seal was granted to Yūmei Luenah by the Dragon Sage. Unlike most seals, it doesn't gain physical form until he transfers his own chakra inside of it, of which is capable of containing a near-limitless amount. Containing chakra isn't all it can do though; it can modify Yūmei's chakra signature on a whim, which combined with its ability to store his monstrous reservoir of chakra, can effectively cloak himself from even the keenest of sensors. Not only this, but it can drastically extend the period of time the Transformation Technique is active, as long as it isn't activated to bolster his own powers, capable of producing the ultimate disguise. Of course for this disguise to work, he'd need to reduce his overall potential by a considerable amount.

The seal originates from a mark positioned on Yūmei, of which then branches off across his body as more chakra is stored inside of it, though remains hidden until activated.