[zepath]

I always thought of Tzeentch as more of a manipulator and a string-puller than having any real force in the physical world. He works through agents. It's quite cheap to take that pretender (the "Bringer of Change") and have him start the game awake and with Astral-10 (if you so wish). He's also got a fat research bonus. My interpretation may be off, of course, as I've never been a serious player of Chaos in the Warhammer games and usually just see it across the table and hope to destroy it. I feel like I could do a lot more with the Slaanesh pretender -- considered giving him/her/it the Seduction ability, but while fitting it would be odd on a pretender.