Q: How does a power that targets ‘the Psyker’ but not his unit work on a unit with Brotherhood of Psykers? If, for example, a Wyrdvane Psyker squad casts Iron Arm, does one model nominated as ‘the caster’ receive the benefits? A: The power applies to all ‘Brotherhood of Psykers’ models in the unit.
So does this mean a GK librarian in a unit of terminators can cast something like Precognition (re-rolls for the psyker) and it affects everybody in the unit? Just curious, I can read it either way.