Editing Warhammer 40,000/7th Edition Tactics/Chaos Space Marines (section)

===The Purge (Forgeworld)===
An FOC from the IA:Vraks book, that also can be filled by Chaos Space Marines as well as the Vraksian Renegades. This detachment requires 1 HQ and 2 Elites, with the option for an additional HQ up to 4 additional Elites, 8 Troops, 4 Heavy Support and a Fortification. You don't get any Fast Attacks, and the formation cannot take '''any''' Marks other than Nurgle. In exchange, any Missile Launchers in the detachment can take Chemical Rockets, and any flamer weapons can be swapped for Chemical Flamers for free. Chemical Rockets are AP 5 Frag Missiles with Shred and Gets Hot, and Chemical Flamers are regular Flamers with Shred & Gets Hot. Not bad! There's a second bonus that any Barrage weapons from this Formation leave Dangerous terrain markers, but Chaos Marines don't get any barrage weapons anyway outside of Forgeworld, and the FW options they do get are expensive!
*Although this is nominally a Nurgle formation, there is no requirement to actually take any models with Marks in it. The big thing this formation allows you to do is bypass a Troop tax altogether and just cram in Elites/Heavy Supports in a way normal Chaos armies can't do. Whether you want to run mass Chosen without paying for Abaddon/the Veterans tax from Black Legion, whether you want to do solo Obliterator/Mutilator MSU builds, or whether you just want to add a bunch of Walkers to another army/play Chaos Mechwarrior, this formation allows surprising amount of flexibility.
*Though it probably was '''not''' intended and was probably a rules oversight, there is nothing preventing you from taking Daemons or vehicle Dedications of another Chaos God. For example, you could use this formation to run Blood Slaughterers if you were so inclined. 
*The detachment is decent and fluffy, yes, but losing out on all those hard-hitting and cool Nurgle Fast Attack options (Heldrakes, Spawn, Bikers, and ''Blight Drones'', ironically) really does hurt - especially in maelstrom missions where zipping around the board to capture an objective helps a lot. Depending on what you want to do with the list, you can either go "all in" with the army theme, or supplement it with additional formations; the Heldrake Terror Pack from Traitor's Hate gives your Drakes back, while the Daemonkin Gorepack gives durable speed to round you out nicely. You could always just use Termicide for your mandatory Elites, and use the Heavy Support to spam Maulerfiends...
**You could still grab your cheaper, zippier Assault Vehicle DTs (Dreadclaws), maybe even a couple Kharybdis, and just burninate your Chosen and Dreads into position. Or, if you have loads of cash and don't mind being [[That Guy|that guy]], buy an Air Superiority Detachment full of Assault Pods and cackle as your Wings of pods descend and burn in perfect formation right when you need them to (and now you have some ObSec to boot, just remember that the hull should be no more than 3 inches off of the tabletop.).
**If you really do need some fast infantry and were using this detachment without marks consider making your guys Night Lords. They can take Raptors as troops, giving you a (very) little something of your fast attack back.
*The wording is such that you can take '''both''' renegades, AND Chaos Marines! Have fun with hoards of zombies marching in front of your Plague Marines as artillery obliterates anything strong enough to inconvenience those fat asses. Actually, the consensus on the matter is that mixing and matching units from the two codices is not allowed. There seems to be no official errata on the matter, but a couple of e-mail replies from FW state that it shouldn't be done - which means that you can probably get away with it, if your opponent looks the other way, but don't count on doing so in a more strict setting. Take Typhus - you get no uberzombies, but his regular ones are good enough. Or take a Helcult with MoN.