Damien's body was completely destroyed in the darkness. His physical form and soul were both gone, so in a certain sense, he could be considered dead.
The human known as Damien Void was already exterminated, however, he was no longer human in body and soul. He was a Supreme, and his body responded to death like a Supreme's would.
His existence maintained itself. His Legend shined bright through the blackness and created a place for him to exist. The Void Soul and Void Physique still existed, anchored to that essence. They were ready to reappear at any time.
This kind of state could not be considered disadvantageous in any other situation. Damien was essentially impervious like this, and with resurrection on the horizon, he wouldn't usually experience danger even if he was forced into such a corner.