The Demon Prince Diaberlic really was resurrected by the Demon King Nag through some means.
But for Diaberlic, this might not be such a good thing. It was a taste more terrifying than death itself, a hell that Diaberlic desperately despaired of, yet from which he could never escape.
His body was already a wreck, with barely any intact flesh to be found, and in some places bones were starkly visible. Thick, foul-smelling blood continually flowed down Diaberlic's body, sticking to the stone plate beneath him, releasing waves of malodorous stench.
The only thing that could be considered remotely intact was his head, which had suffered slightly less damage to flesh and skin; but even so, his face was distorted into a knot from prolonged torture and pain.
He wanted to die, yet was not allowed.
The face that was once considered handsome and dashing had now become particularly ugly.