Just beat someone to death, cut them open, take out any bone in their body, then snap it in half.

Description: Underfell and Dustfell Sans | Edgy. | Underfell sans: the hardest monster.. | Lvl: 4, Hp: 17, Atk: 17, Def: 17 | Likes: Burgers, Mustard, Relish, teasing the player, jokes (especially Knock-Knock Jokes), Frisk (currently) | Hates: Talking about his feelings to anyone, Humanity, Calling Papyrus "Boss", Frisk (formerly), Ketchup | 25 years old | Nicknames: EdgyLord, Edge, Red, Nega Sans, Pepper, Rustle, and Dog | Theme: https://soundcloud.com/sharaxsierra/underfell-original-sharax-red-light | Other theme: https://soundcloud.com/keno9988iii/undertale-au-underfell-megalovania | DustFell Sans | Dustfell Sans: Lvl: 20, Hp: 473, Atk: 49, Def: 49 | Likes: Mustard, Burgers, Relish, Dark jokes | Hates: The human, Calling papyrus "boss" | Killed everyone he loved | Nicknames are the same | Theme: https://soundcloud.com/user-744659538/dustfell-the-theovaniac | Phase 2 theme: https://soundcloud.com/der_zocker/dustfell-blood-red-megalovania | Used by Detro | Credit to: "Fusion12345" On Pixilart for the phantom papyrus | Do not steal without permission |