Hi, ive got a question about the space marine force weapon that lib's can take. In the rules it states that it does not allow a armor save, and if i pass my leadership test then the enemy dies. A friend of mine takes a invunerable when i wound and says he gets to take one since the insta kill is a pysic power so hes gettin 2 invul saves for 1 attack. I personally think something isnt right about that. Can any of you clarify ??