Largest Known Black Hole Novels & Stories

Sylvio was shocked into a cold sweat by the huge black hole in front of him. One-tenth of the previous level 8 civilization seemed to be covered by it. And it was still expanding. So how big was this black hole? If it was left over from Lufian's battle with the Robotias, there was no doubt that the Robotias also had a Heavenly Overlord. Perhaps only the collision of two Heavenly Overlords could form such a large black hole. It seemed that they all seriously underestimated the strength of the Robotias.