Ravenwing units may re-roll the dice if they fail a Difficult Terrain test. In addition, they gain a 6+ Invulnerable Save against any enemy shooting attacks as long as they moved in their previous movement phase. This save may be taken instead of their normal Armour Save, not in addition to it. Land Speeders and attack bikes are also allowed to take this special saving throw, even though Land Speeders are vehicles and therefore do not normally get a save.
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