You can re-roll one saving throw each turn for each model from this Formation.
Whilst Grand Master Voldus and Rouboute Guilliman are on the battlefield, all friendly units with the Armies of the Imperium Faction have the Stubborn special rule.
When a unit that contains at least one model with this special rule takes Morale checks or Pinning tests, they ignore any negative Leadership modifiers. If a unit is both Fearless and Stubborn, it uses the rules for Fearless instead.
