>>96095606
Host of Ascension detachment gives you ignores cover and sustained hits one when you come from strategic reserves, and everything except for vehicles have deep strike army wide. You get a Primus, which gives full rerolls to hit and give him Chink in their Armor enhancement for giving his unit Lethal Hits when they come from reserves. You pair that up with Primed and Readied strategem, go crit on 5+. Now you have a big unit of 20 neophyes with lethal hits and sustained hits 1, full rerolls and ignores cover. You hit a target with a Ridgerunner to give your Neophytes AP1, and they just slaughter shit. If your opponent shoots at them, you can put the remaining models in strategic reserves again to repeat the same stuff. The cult icon to bring dead models back work when the unit is in reserves so you can bring up to 3 models while in reserves as well.
That being said they're expensive for a unit of 65pts, a slog to paint because even your most basic guy is full of details that have no easy means of painting. I've seen 2000pts lists that run 80 or more of them so good luck. I painted 40 of them and I'm done, and I have 30 more on sprue.