In the Helbrute Dataslate, one of the formations (Helfist Murderpack) has one Helbrute designated as a Champion in a unit of 5 Helbrutes. This Helbrute Champion gets the Champions of Chaos Special rule, as well as the Aura of Dark Glory rule.
Aura of Dark Glory confers a 5+ invulnerable save.
How do invuln saves work on a vehicle?
A save of any kind (Armour, Cover, Invuln) normally works as a roll taken to negate a wound suffered by a model that actually has wounds.
An exception is made in the rules for Cover saves, stating in the vehicles section that an obscured vehicle, or a vehicle granted a cover save via special rules, can take a cover save to negate a glancing or pentrating hit.
However, that passage only applies to cover saves- it says nothing about how an invulnerable save would work on a vehicle. At no place in the Helbrute dataslate is how this works explained.
I guess that you are supposed to treat the Helbrute invuln save in the same way as you would a cover save, but it would be nice if there was some clarification somewhere, as RAW supplies no rules for how to resolve an invuln save on a vehicle.
Aura of Dark Glory confers a 5+ invulnerable save.
How do invuln saves work on a vehicle?
A save of any kind (Armour, Cover, Invuln) normally works as a roll taken to negate a wound suffered by a model that actually has wounds.
An exception is made in the rules for Cover saves, stating in the vehicles section that an obscured vehicle, or a vehicle granted a cover save via special rules, can take a cover save to negate a glancing or pentrating hit.
However, that passage only applies to cover saves- it says nothing about how an invulnerable save would work on a vehicle. At no place in the Helbrute dataslate is how this works explained.
I guess that you are supposed to treat the Helbrute invuln save in the same way as you would a cover save, but it would be nice if there was some clarification somewhere, as RAW supplies no rules for how to resolve an invuln save on a vehicle.