TheOldSkall

If I want to run a disciples of Tzeench army, can I put the mark of Tzeench on my chaos warriors, Chariots and knights to make them disciples of Tzeench? I remember reading in the generals handbook that you can only bring a certain number of points in allied units. So if half my points are from Tzeench demons and the other half are from slaves of darkness units, can I put the mark of Tzeench on those chaos units and make them compatible with the demons?