Chaos Space Marines

Chaos Space Marines are the absolute worst antag that can appear on the outpost barring a Warp Storm. Heavily armed and armored and lacking in the sanity department, Chaos Space Marines are the replacement for the standard Nuke Ops.

Choice of Warband
Your actions differ depending on your Warband/Legion/the warband/Legion your bunch originally comes from. The ones currently available are:

World Eaters
The default, murder-happy Khornate Berzerkers, screaming about THE BLOOD GAWD and how good he is. You usually end up murdering every living soul.

-Are you praising the blood god yet? Piled up some heads for the skull throne? No? Get. ON. DAT. SHIET. FER TEH BLUD GED!And don't forget to duel wield dem chain-axes like a true khorn berserker.(Because bolters are for wusses and nerds.)

Word Bearers
The deeply religious of the pair. Word Bearers are more likely to sacrifice and taunt their foes than outright slaughtering them like the Khornates.

-Also, make it a personal objective to become as much of a book as possible.(If you are not draped in layers of papers you aren't living up to the wordbearer name.)

Red Corsairs
Alternatively, you can tell the Chaos Gods to piss off, and play with the Red Corsairs, badass motherfuckin' space marine pirates. Generally the most sane of the bunch, being Renegade Space Marines instead of Chaos Marines.

Your Single, Solitary Job that is 99.99999% Failproof
Get. Dat. Fukken. Disk.

It's easy as that. Get disk. Arm nuke. Leave.

Occasionally, you'll be given fitting Admin objectives, like KILL ALL THE FUCKERS AND PUT THEM IN A BIG BLOODY PILE FOR KHORNE or DEFACE THE STATION AND BRING IT UNDER THE FOLD OF KAYOSS. Do these.

CSMs usually get along with all antags (Word Bearers) or every antag except Slaaneshi Heretics/Cultists or Tzeentchians(World Eaters). Be wary.

The Real Combat Experience
You have very good weaponry and armor, but it does not mean these fellow won't try to stop you
 * Inquisitors are not much of a threat, but they have a artilery hidden in they base in inquisition office, destroy it as soon as possible
 * Lord General needs to be killed as soon as possible, his plasma gun will kill you very quick and your chimeras like nothing
 * Commissar and his Imperial Guards can be very annoying, very fucking annoying and they have access to armory...destroy it
 * Lord Inquisitor and his acolytes can make autocannons and he has a bolt pistol, all are very dangerous and must be killed
 * ORKS and Tyranids can kill you very quick with their stikkbombs or venomthropes or etc, so be careful engaging them
 * And for the last time, try to kill everyone, leaving someone alive can be a very bad thing