The herald of Tzeentch is highly configurable, much like all of the heralds.  But the thing that really appeals to me is the ability to configure them as a high level psyker for a low points level.  Importantly, the not only get access to Tzeentch's own Change discipline, but they also get access to Divination.  Much has already been made of how good divination can be, so I won't repeat that

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