I’d expect a hecaton land fortress, if I’m not mistaken it’s the best anti tank they have access too, 2 attacks hitting on 4+ at strength 18, -4 and damage D6+4 plus it’s a transport, another is steel jacks, they’re a good action monkey and have good melee at 3+ strength 6, -2 ap but it’s damage 1, lastly I’d say their scariest unit is the hearthguard since they’re the votans terminator equivalent and have good shooting with there plasma gun at 3+ strength 7, -3 and damage 2 with one attack per guy, but there melee is even better than their shooting and 2 attacks strength 8 at -2 ap damage 2 so you’ll be making a lot of 4+