[ He frowns, with an expression that suggests he can't believe it's even a question. ]

My entire body was remade. Undeath undoes you, and then reworks you. A death knight suffers constant pain, as I said. Food is ash, and no longer necessary. Nor sleep, nor any kind of rest.

[ He makes a sweeping, agitated gesture with his hand. ]

No part of you is untouched. All is warped, and monstrous.