Unbreakable

Models with this rule have Immunity (Psychology) and pass Break tests automatically. However, they may never choose Flee! as a charge reaction.

Characters that are Unbreakable may only join units that are also Unbreakable, and characters that are not Unbreakable are not permitted to join units that are Unbreakable (even if a character is Unstable or was to become temporarily Unbreakable for some reason).