I don't know which models you have but I always used to run Coteaz in a purgation squad w. 4 psycannons. He'd roll on divination and whichever power you got (with the exception of the 6th one, which is always to be swapped for primaris), he'd be amazing!
Primaris- 16 S7 AP4 Rending BS4 with rerolls to hit :O
1- same number of shots at BS4 on overwatch :O
2- 4+ invuln. on a unit within 24"- useful as hell.
3- make an enemy unit reroll saves... ERMAHGERD this is too good to be true against
TEQ/
MEQ lists.
4- ignores cover when combined with astral aim..? Yes, please
5- coteaz rerolls everything, pretty much. Parked in a ruin he has a 2+ save with a re roll, and a 4+ cover, with a reroll, and 3 wounds. Just make sure he's at the front of the unit with this one!
^^ obviously some of these go better in combos.
I'd run one or two units of that (inquisitor with force sword & power armour for squad no. 2, and a conversion beamer if you must :L) and then some henchmen (
DCA, crusaders) with some paladins and strike squads as back up...
Then laugh as you kill anything and everything.
Also take a bastion