With the comment about sky fire above all I have to say on that front is Vengeance Weapon Battery, upgrade to a Twin Linked Quad Icarus and that little issue about pesky flyers is taken care of. Then let your knights, sisters or any army you field get down to the business of breaking faces. I run it a lot and it usually earns it's points and some back for me. It's a resilient little soul so shrugs off a lot of damage if people can be bothered to shoot at it. Heck if you've bought the two kits to merge them together then you have enough for two. And it's cheaper than a Nephilim and going to be a pain in anyone's thrust nacelle's....