Chaos Undivided
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Chaos Undivided is a belief among followers of Chaos in Warhammer 40,000. Formed by Lorgar, the Primarch of the Word Bearers, Chaos Undivided holds that the Chaos Gods are a pantheon of Gods, or venerate Chaos as a unified whole. Followers of Chaos Undivided maintain that worshiping all four Gods allows one to draw on all the strengths of the Chaos Gods without falling to weaknesses (Khorne's all out rage, Slaanesh's need for sensation, Nurgle's decaying influence, or Tzeentch's more detrimental mutations).
While followers of a single god (such as the World Eaters, the Thousand Sons, or the Emperor's Children) would hold that they are weaklings who cannot chose a single God to venerate, there is some evidence to its benefits. Of the Traitor Legions who follow Chaos Undivided (the Black Legion, the Iron Warriors, and the Word Bearers), these three have not fractured in disunited warbands, and are actually able to maintain the drilled discipline one would find in the Adeptus Astartes, allowing them more precision than a follow of Khorne or Slaanesh would show. On the other hand, the greatest champion of Chaos Undivided is Ezekyle Abaddon, the Warmaster of Chaos. Given that Abaddon hasn't conquered the Imperium of Man in ten thousand years, this says a lot of Chaos Undivided.
The most well-known to /tg/ follower of Chaos Undivided would be the fangtoothed woman who calls herself 'Cultist'.