OOC: You can do only one thing at a time here - Either go and try to purify yourself, or go and try to blast the Terminator (and possible your brothers, too) with warp magicks! ^^
Grav-tanks, start lightening up the Rhinos armor, slap a few land speeder grav plates on there, add some heavy weapons and we can be wannabe Eldar!
Hmmm divide the Chapter up, Companies of Siege nutters with all sorts of crazy grav-tanks and infantry formations, then our heavy, lumbering Fortress units which can be all our vehicle and battle suit variants.