darkoms wrote:So, if Tzeentch is the god of ALL magic, can he and his servants use the psychic powers of other chaos gods? This is a question about fluff, not about the game.
For example, can the Lord of Changes in fluff use the discipline of Slaanesh or Nurgle?
No, because "disciplines" among daemons are game constructs that don't exist in the fluff.
A Lord of Change would be able to create vile plagues or enticing illusions using daemonic magic, but that doesn't mean it's using the "discipline of Nurgle/Slaanesh".