Here are the basics:
Pask in a Leman Russ Punisher.
2 x Leman Russ Eradicators.
SO, where to get started. Why have we chosen to use Pask in the first place? Well, he isn't a bad choice. He was okay in the last book, and only got better in this one. Choosing him in a punisher will give the 20 shots rending, which is a great bonus. The 24" range is greatly debilitating on 6x4 boards where your opponent can escape the 30" range. Consequently, as I said before, the best option for this unit is whilst playing a 4x4 board. It's not invincible, Meltaguns/Wraithcannons, or anything else will still cause you problems. One option to keep this lot alive would be to combine this with a fearless blob of conscripts, OR bring a bunch of Primaris psykers and hope for 4+ invul.
Why the eradicators? Well, they are an insanely good bargain at 120 points. Their large blast is average against anything with a 2+ or 3+ armour save, but you can leave Pask to deal with those. Plus, if you are facing off against such targets, having your opponent roll more armour saves is what will win you the game. You can't fail them if you aren't rolling them! Anyway, if you happen to face off against Tau/Eldar/Tyranids/Guard/Dark Eldar then you will be laughing.
So, best thing to do is just park these boys smack bang in the middle of your lines, driving forward whilst using the tank commanders orders to shoot at two different targets. Make sure you bring along a Prescience giver to boost the unit. Also, if Pask is your warlord, he and his unit gain Preferred enemy against a codex of your choice. Basically meaning that you will be re-rolling to hit and re-rolling to wound vs most enemies. Pask vs T4 will only be re-rolling those 1's to wound, but that is still pretty damn good. Especially since every one of those re-rolls is an additional chance for rending.
Give it a go. It's not hugely expensive, you make sure you protect it.
- Out.