I'm thinking about swapping a TSons Prince for a Nurgle Prince. While they can't get buffed to the same levels, I can use the second Nurgle power and the reroll aura to make my
PBs a super UNIT. If the Prince sits next to the Nurgerald he'll be S8, and can just be a charge deterrent/countercharge.
At that point, I might also drop the Scrivener and instead take a Sorcerer, since I want all those Tzeentch powers! However, that would significant downgrade the threat output of the Virus Bomb.
So it would look like this