Glamour of Tzeentch

Glamour of Tzeentch has a warp charge value of 7.
If manifested, select a friendly Thousand Sons
unit within 12" of the psyker. Until the start of
your next Psychic phase, your opponents must subtract 1 from any hit rolls they make for
models that target that unit.
The psyker twists and obscures the perceptions of his
foes to the point that his allies become all but invisible.