Odd little quandary: does Chaos have "typical" Exterminatus devices? 10,000 years ago, Horus divided the Imperium almost neatly in half, taking not just half of the Astartes with him, and wrecking several Legions who wouldn't go, but also sucking in numerous assets of the Imperial Army, the Adeptus Mechanicus, and numerous other organizations. So, if they happened to steal numerous void craft, numerous DarkMech, Titans, Knights, Tanks, and such, did they not also get several planet breakers, or have the minds and assets to fabricate them?
I ask this because, if Chaos has EWs, they don't usually seem to use them. Sure, they might wreck some planets in their own ways, and Abaddon had the Planet Killer built, and held several Blackstones at his command, but where are the virus bombs (Nurgle?), the cyclonic torpedoes (do warp masters even need the torpedoes?), magna meltas, and other "typical" means in which an Inquisitor might deliver judgment upon your world? I know Terra is hellofawell defended, but Abaddon didn't loose anything apocalyptic on Cadia (does he need the Cadians alive?), when he tried to take the planet last. There are a number of times where I imagine a big Chaos ship could just blink out of the warp, hit a world with the device, and win the day. It might not be their style, but is it something that they CANNOT do? Do the Dark Gods forbid it, in favor of more lame Cultists?