The Undying

The Undying is a horrifically disfigured Starved, which was once Undyne the Undying, but has merged with what remains of other members of the Royal Guard upon becoming a Starved. It is able to regrow all severed appendages at an astonishing rate, meaning that it can not be terminated in the same way as other Starved variants. Although this abomination has never been defeated before, it could hypothetically be terminated if every single cell were to be destroyed. It now claims the lava fields of Hotlands as its domain, tearing apart any prey that draws too near to it.

The Undying came into existance during the early days of the Starvation. The Royal Guard was summoned to New Home by Toriel, to help aide with the evacuation, and to help supress any attacks from the Starvers. Unfortunately, the predicted number of infected was well undershot, and the Guard was violently swarmed by enourmous hoardes of Starved. In the chaos, Undyne was critically wounded, yet refusing to give up, she became Undyne The Undying. Even though she now held immense power, she was still unable to overcome the sheer numbers of starved, and sucumbed to the hoard.