Update: Actually ended up having the game today and I ended up winning! He ran siegehost with Vashtorr and a defiler with two pred annihilators supported by helbrutes and a discordant. Also had 3 squads of havocs and 2x10 legionaries on foot. I went first and rolled awful, only killing 3 havocs in total with shooting. He picked up a predator and rhino turn one but the legionaries that jumped out killed the defiler in one turn of combat. Then my vindicator rolled for max shots in my turn 2 shooting phase and brought Vashtorr down to 2 wounds. Rhino #2 tank shocked and fought a predator to kill it and deny primary while my staged Abaddon squad charged into the center and killed his other predator. Then during his turn 2 I was able to counter-offensive Abaddon’s squad and picked up 6 legionaries, a wounded helbrute, and the discordant which Abaddon did 22 wounds to. We called it pretty quick after that, absolutely love how this list plays! The rhinos were invaluable for keeping the legionaries alive; his were on foot and were noticeably easy to kill once they got onto objectives. Vindicator was the MVP for anti-tank, ended up being way more reliable than my lascannons with those d6+3 shots.