When i say 'mixed' I don't just mean like, a whole coven on the table with a couple of units dribbling out of the portal. I'll start as little as i can on the table, usually two heamies with a unit in a raider, each ready to open a new board edge and pretty much everything else waiting to come through either one.
Yes I do use Taloi, dunno why i didn't mention that in the first post, they're one of my favourite units and the whole reason i decided to do a coven/
wwp list!
I know hellions aren't amazing, I've just always had a thing for their models so i like to include them, if nothing else just to pat them on the heads and go "you did wonderful, brave little soldiers

"
My question was mainly directed towards wracks and grotesques. How competitive are they, and how would the playstyle have to vary from say kabalites/wyches and incubi/trueborn?