Uphold the Honour of the Emperor

No unit may benefit from cover for Saving throws. However, such is their faith in the Emperor and their own invulnerability that they shrug off the most severe wounds, and therefore gain a 6+ Invulnerable Saving throw at all times that they may take instead of their normal Armour save.
In addition, all units are immune to the effects of Pinning and can never be pinned, except by being entangled. Vehicles are unaffected by this vow.