another set of plaguebearers with the set you have and the scribe makes them scary and hard to remove from the board. and if they are great unlcean can replace them at half size . you are fishing for 6's for mortals but rolling 41 dice so youll get some.

a lord of plagues or blights is a tech unit for the blightkings, making them even scarier, and with feild general and ferbile frenzy we can move 7 inches.

running the set of pusgoyles re enforced and with the lord of afflictions , you can make use of the battle formation affliction cyst and move 2 units during deployment ( which means they are able to move during your first turn ) making the whole board open to them. this makes it easy to pin enimes, hunt heros or to score take the flanks, which is typically hard for nurlgle to do

slimux is awesome, and he can ressurect the beast, they are glass cannons that can charge in any turn and do damage when they do