Chara is killing everything with her newfound powers and abilities

Sans and Papyrus survived and created Dr Ghaster, your originally one of his experiments. A monster that can be created using dna of monsters from across different timelines

they charge up the machine to create you

Ghaster: “this is it…Our one chance to end Chara”

Papyrus: “you sure this will-“

Sans: “don’t worry Paps. Trust him”

Ghaster looks at the stone tablet which inspired your creation. A tablet that shows the myth behind you…