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I'm working on putting my Black Crusade together, and am adding a small Allied Detachment of Daemons to the mix, so just one Herald of Tzeentch and a unit of Pink Horrors for the extra warp charge & spells.
For now, I'm giving my Herald a Disc so he can find opportunities to detach from the Horror unit (Move, Summon, Turbo), but I have some questions about how "Brotherhood of Psykers" interacts with an IC Psyker.
-Since "Brotherhood of Psykers" applies to a unit that has at least one model with this rule, the Herald would be part of the unit, correct?
-I'm aware that if the Herald is joined, and both the Herald and Horrors know Summoning, I can only cast Summoning once anyway (but if they split, I can cast it twice). However, suppose my Horrors only rolled from Malefic Daemonology, but my Herald only rolled from Divination. When casting Daemonology or Divination Spells, do I:
A) Choose a model in the unit to manifest the power no matter what, with Perils affecting a random model in the unit?
B) Choose a non-Herald model in the unit as the focal point for the Daemonology power, but choose the Herald to manifest the Divination power, with Perils affecting a random model for Daemonology or the Herald for Divination?
C) Something else?
-The Draft FAQ states that when a Blessing that affects the Psyker itself is applied to a unit with Brotherhood of Psykers, the entire unit benefits from it. Does this apply when the unit receives a Blessing that it did not know by itself? For example, if the Herald successfully cast Forewarning (The Psyker rerolls all hits/wounds/saves) while joined to the Horrors, would the entire unit benefit from the rerolls or just the Herald?

THe Herald doesnt have the BoP rule. So dont count him when casting horror spells