x2 Librarians + Jump Packs + Blood Lance + Shield of Sanguinis + Epistolary
This fits any chaos legion but world eaters :(.
Kinda depends on how long you have been playing and from what fluff. In Slaves to Darkness, World Eaters had full access to Librarians, Tech Marines, Chaplains, Decestator / Tactical Squads and medics. Khorne at the time didn't care how you killed your opponent only that you do. The World Eaters were a fully functional chapter that served Choas. In Fantasy Battle using Slaves to Darkness, worshippers of Korne could be blessed with Hvy Bolters, Las Cannon etc to make up for his disdain for magic.
As for me, this is pre-heresy list. Even when I play it as full blown Chaos I have a hard time believing the fluff that games workshop has written. World Eaters are now simple Beserkers with no other organization? Who drives their vehicles? Who transports them? How to you keep them all together with out them going for a free for all in confined transports? How do they keep replacing their numbers? With all the wars Chaos has fought, several traitor legions would be extinct due to loss of man power as they have no way of replicating the geneseed nor the ability to simply create a marine out of thin air or turn a normal man into a marine.
A great example is read all the stories between Horus and the Emperor in their final battle. The original story was great but every time its retold its exaggerated and changes by the new story teller. The orginal story in their final battle, the Emperor was so powerful that at any time in their confrontation he could of utterly destroyed Horus as his power was that great and nothing Chaos could do about it. Yet it was his love for his children that prevented him from do that. Horus unloaded on the Emperor and the Emperor would not fight back still in disbelief and for his love until near death did he see Sanguinis body. Yet now in the
BA codex the story is retold that the Emperor didn't have the power to kill Horus on his own but the battle between Sanguinis and Horus left Horus's armor with an exposed spot for which the emperor could kill him.