Treason of Tzeentch

Treason of Tzeentch has a warp charge value of 8
If manifested select an enemy CHARACTER that
is within 18" of the psyker and visible to it
(excluding opponent's Warlord) and roll 2D6.
If the result is greater than the character's
Leadership, you can treat the model as if it were
a friendly model in your army in your Shooting,
Charge, and Fight phases. At the of the Fight
phase, the character reverts to an enemy model.