in the old fluff, you could worship the whole pantheon without committing too much to any of the four or you could just sell your soul to one and consacrate your life to him. Up to the 3rd codex, the undivided crew was the most numerous ,organized and mentally stable. Then, with 5th edition, you basically HAD to choose a god and chaos undivided was almost obliterated from the records.
But not fully? Implying you can still manage to worship all four Gods?
Originally Posted by Brother Lucian
Chaos undivided followers, often tends to be the ones capable of uniting the fractitious lot for a short time. Archaon Everchosen or Horus.
From the stuff I read I'd already gathered this, but my question wasn't so much as, ''what do they do'' more of, ''how do they do it?''