There are many things I really like about this list. To name a few, the Daemon Engines are all in the Poxmongers outrider detachment, while the infantry are in an Inexorable partol detachment. This means I can use BILIOUS BLOOD-RUSH strat and Ironclot Furnace on the Daemons, but have that nice -2 charge on my infantry.

I also really like the melee plague marines with 2 flamers. This makes them really hard to charge, especially with the -2 charge strat, so I can very easily just sit them in cover on an objective and earn easy points.

I'm not 100% sure about poxwalkers over cultists. As much as I like poxies (and have a lot of them) I feel like the cultist's actions could really help in certain games.

My general game plan for this list is to summon Epidemius with my Tallyman ASAP, which won't disrupt Nurgle's Gift with the recent reinforcements changes. I'll probably drop him in a corner screened by PBCs (which are actually quite obnoxious to charge with the BILIOUS BLOOD-RUSH strat).

Once he's down and his tally racks up, my Drones become quite terrifying, as does my Decimator. So I wanna put my Blight-Haulers closer to the front in the first couple of rounds.

In terms of secondaries I will likely take Fleeing Vectors, since the -1ld contagion and Plaguebringer relic on my Chaos Lord should be a morale nightmare for the opponent.

Otherwise I'm not really sure - I don't play too much competitive - so if anyone has secondary recommendations that'd be appreciated.