The White Dwarf is so ancient and battle-hardened that he is Unbreakable. So fearless is he that if his chosen unit breaks and flees, for any reason, he will always stand his ground. If the unit was engaged in combat, he will stand firm and continue to fight while his unit flees, denying the foe the chance to pursue. Grombrindal can even join a unit that does not have the Unbreakable special rule – this is an exception to the normal Unbreakable rules.