Khorne Berzerkers
Berserkers are Chaos Space Marines who are dedicated to Khorne. They will fuck your shit up.
Berserkers started out as World Eaters who Angron decided should have their brains fucked with, like him. When that was done, they feel nothing but eternal RRRAAAAGGGGEEE. Apparently, it also makes them want to worship Khorne. Berserkers, also known as Khorne Berserkers, are normal Chaos Space Marines armed with Chainaxes. But what makes them different from a normal Chaos Space Marine? Well, the answer is simple:
Their huge levels of RAAAAAAAAAAAAAAAAAAAAGGGGGGGEEE that has spawned out of their worship of Khorne, and also partial lobotomizing, to make them have even more rage! Great job Angron! Also they carry Gifts of Khorne, which make them even more uberkill in melee, and that's the only thing they can do properly. By the Gods, I wonder how they manage normal life.
And everyone knows that Berserkers have a place in their soul for sex
Unlike those pansy-ass rock star wannabes, Berserkers are good at only on thing: melee. Needless to say their main tactical purpose is to get in close to the enemy and then kill, maim and/or burn. With the Mark of Khorne, 2 weapons and Furious Charge they'll win most fights and they will dominate in hand-to-hand provided they get the charge, supplying them with a major advantage of +1S, +1I, (ha! No more thanks to 6th edition and probably your Spiritual Liege) and +1A. Thankfully the new Chaos codex has given them Counter-Attack.
The weaknesses of the Berserkers is that they have a price tag of 21 points per model and only have a few options, like a personal icon and a pair of plasma pistols (mentioned above, shooting isn't their thing), and the fancy wargear is accessible to the one model you upgrade to a Skull Champion. Not to mention that they can't fall out of the sky like a grimdark Batman or a vampire or a goddamn beakie; they'll need a Metal Box or a Land Raider to get to grips with the enemy without being shot to death if fighting a Tau gunline or a Necron phalanx. In 4th and 5th edition, the fact that they died just as easily to shooting meant that they were mostly overshadowed by Plague Marines.