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Daemon Prince 485
Nurgle, Enchanted shield, Chaos familiar, Soul feeder

Exalted Hero 189
Nurgle, Shield, Halberd, Magic BSB Warbanner

Festus 190

18 Warriors of Chaos 336
Nurgle, Shield, Full command

18 Warriors of Chaos 336
Nurgle, Shield, Full command

18 Chosen 479
Nurgle, Shield, Halberd, Full command

Hell Cannon 210

Gorebeast Chariot 140
Nurgle

Warshrine 135
Nurgle

I know it's not optimized and a little light on units, but I really wanted to stick to a warrior heavy, all nurgle theme for fun.

Chosen anchor the middle of the line with a block of warriors on each side, daemon prince handles one flank, cannon takes the other with the gorebeast chariot in suppot, warshrine starts closer to the deamon prince side but stays in range of the chosen and 2 warrior blocks. Festus and bsb go with the chosen group.

Not entirely sure if I should keep the hellcannon; having that strong reach seems good, but could be unreliable. I considered putting a group of knights in instead for a little added speed.

I vote take the knights over the cannon. Or another gorebeast chariot, You deffo need some warhounds/marauder horsemen aswell.
What else have you given the Daemon Prince? You sure thats all of it for 485pts?

Ah yes, forgot to mention he also has armor, wings, and level 4 wizard.

Given you wanna keep infantry and nurgle-heavy:

I'd drop the hellcannon and the warbanner. I'd get a ward save and/or some magic armor on your BSB, and also some more anti-chaff: knights, hounds, horsemen or more chariots.

^ I think this guy nailed it better protection for your BSB is critical since he gives you rerolls. if he's going in the Chosen unit, they can take a magic banner worth up to 50 pts just stick it on them and your good. Ohh almost forgot MoN Chaos Knights would really go a long way in this list. They are nasty!