[A/N: Webnovel messed up. The automatic scheduler posted this chap in the last volume. WN won't let me delete that chapter now, nor edit its contents.]
Sylvester had, for the most part, ruined the Empire. But the powerhouses of the Empire were still intact. He had only killed two Grand Wizards in the underground city before, and that only brought down the number of Grand Wizards from twenty-five to twenty-three. He knew he had to hasten his killing spree, but the problem with going after the Grand Wizards was that they were quite strong, and required him to extensively use Elder Magic.
At the same time, he feared that if he killed them one by one, it would alert all the others that someone was targeting them. That could result in them either hiding away or choosing to stay in groups, making it hard for him.