So four Incubi get into a Venom and bring Karandras along, 'case he'e just admitted that yes, he does know their Secret OriginsTM. They then fly out of a Webway Gate dropped by their friendly neighbourhood Haemonculi (who's decided to hide amongst his friends, the meat-shield Grotesques) and smash the absolute sh!t out of everyone's face because they're bestest friends forever.
Now, yes, they are an insane amount of points for what is basically a unit of Terminator-killers, but what do people think?
I reckon it'd work.