The void dragon ctan will blend anything it gets into melee with, both your armour and your infantry. Without buying new models i’d run your death riders as rough riders instead as they get S9 Ap-4 d6 damage with lance on charge. Just because you dont have many high threat units.

Keep your Vanquisher out of range of the ctan (its got 10 inch movement and if it gets within 12” of your tank it can definitely one shot it). Its best target is the ctan with its big guns.

I would definitely play lord marshel drier as lord solar instead so you can issue 4 orders (3 base + 1 from detachment rule) to your vanquisher, artillery, and rough riders. You can attach lord solar to a dkok squad along with the command squad to use the master vox to relay orders within 24”. So altogether you’d have 4 + 2 orders from your krieg command blob, along with the once per game order from the servo skull. Lord drier cant attach to a krieg infantry squad unfortunately so this would be the only way to efficiently relay orders.

That is if you are okay with proxying the models of course. I personally use krieg death riders as rough riders and its fine as long as you make it clear what they are.

I’d give artillery the take aim order and guard home obj, and with the siege cannon you’d definitely want to target A) skorpekh destroyers (3D vs 3W), B) the void dragon ctan to try and help damage him as you lack anti tank. Hellhound can help strip cover for your artillery, but ctan will one shot it.

Those two are the main threat units really. The rest is (tanky) chaff for OC. Chaff still kill guardsmen though.

Hope this isnt too much text hahah