Corrective Penance

Dogmata only. Once per battle, at the end of the battle, if this model is on the battlefield, you can select one other Adepta Sororitas unit from your Crusade army that has one or more Battle Traits and spend 1RP. If you do, select one Battle Trait that the unit has and replace it with a new Adepta Sororitas Battle Trait that the unit could have.