I know it's a horrible and gross question and I apologize if someone asked already. But if Sans or Papyrus got caught by another monster (which I would hate to see happen), would they really have anything to eat per say ? Bones are...difficult to ingest right ? Unless they would eat their magic ? Or maybe the big predators have evolved and are able to eat bones now ? I'm sorry, just curious...

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There’s good marrow in those bones, and a lot of power in it, due to the brothers’ strength. It would be a horribly painful way to die, having your bones broken open and sucked dry one by one. Best avoided if possible.