[pet peeve]Why do so many people not include the dedicated transport with the unit purchasing it so the list is more easily legible? It's not a separate item, it's an upgrade to a squad - it should be listed with the squad buying the upgrade, just like if you buy a Blaster or something.[/pet peeve]
You have 9 squads and 8 vehicles, so someone is walking...the Wracks? I'm guessing the Wracks. i dunno. I'll presume them since it's silly to walk the Grots as that will waste time, and the Wracks are the only other singular unit.
Are you really running the Warriors with no Blasters? And the Wyches with only HWGs?
No Raiders or Ravager with NS or FF?
I'm guessing that your event has a special rule that allows you to field 4x Elite slots?
Can you run any extra slots besides Elites?
Or is that an error and you can't?
How many caltrops in the RJB squad, 1, 2, 3?
Okay, now I'm going to have to punch up these points, hold on a moment...
Okay...so assuming 3x Caltrops and that every Venom took 2x S.Cannons...I still have you as almost 100 points short.
So I'm guessing you spent that somewhere...where? You're functionally asking us to look at a 1900 point list and asking us how we think it will do at 2000.
Also, seriously, how many caltrops?
And are you allowed to field 4x Elites? If so, can you field 4x Heavy or Fast?
If not, then you're even more short on points.
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Okay, I think I dragged you over the coals on that one enough.
Since you're short almost 100 points let's first off free up a few more.
Implosion Missiles - I do not recommend them. You are paying a premium for those Void Lances, you want to be shooting Void Lances, Void Lances are best shot at mech. Implosion Missiles are useless versus mech. Also, honestly, Implosion Missiles best use is to eat up MCs and blobs of high toughness models. You know what else does that really, really well?
Generic splinter fire. i.e. your Venoms, and Trueborn.
Nurgle is not likely to be able to afford too many blobs, and what blobs it does have you ought to still be able to whittle down with just splinter fire. Yes, the Implosion Missiles will help versus FNP, yes they will ignore the 3+ armor saves (but not cover saves, y'know, if the Nurgle player like basically any Marine player crawls into area terrain). I'm just really not sure I see much value in you spending 60 points for that.
Just shoot Void Lances, I'd say.
Also, I'll admit, I don't think Urien is that solid of an HQ nor are he and his Grots going to exactly shine versus Nurgle. Now, if he is your HQ of choice and/or you're locked into him for the campaign, or, even, if you're just really unfamiliar with other HQs - stick with him. It's better to play something suboptimal you're good with than play something good you've never played before.
That said, Urien is not really helping here and he's eating up a lot of points so your Grots wound on a 3+ instead of a 4+ vs. Plaguemarines. Ehhhhh...
Another immediate thought is, if the Wracks are objective grabbers and lack a ride, why have a 10 man squad? Save some points, make it smaller, leave them in reserve, and just wander out as late as possible to grab a point and then hug the ground and pray.
Now, as far as spending points - my immediate thought is Blasters on the Warrior squads (to drastically increase their threat capability. If you don't want to do this and are just trying to buy the Venom, maybe save points and use 3 man Wrack squads instead? It will fit your theme, be cheaper, and be basically just as good) Or get a Blaster for them
I'd also probably want to slap FFs on my Raiders, Ravagers, and Void Raven. Especially fighting chaos if he has a hell turkey or two.
My immediate thoughts beyond confusion about your build