Про ковер четко прописано
"Cover Save"If the target is obscured and suffers a glancing hit, a penetrating hit, or is otherwise
hit by an enemy shooting attack that inflicts damage upon it (such as being hit by a
weapon with the Graviton special rule), it must take a cover save against it, exactly like a
non-vehicle model would do against a Wound
Тут про инвуль по раву, но принято считать, что он работает
"Invul Save"Invulnerable saves are different to armour saves because they may always be
taken whenever the model suffers a Wound or, in the case of vehicles, suffers
a penetrating or glancing hit – the Armour Piercing value of attacking
weapons has no effect on an invulnerable save.