Any missile weapons that roll to hit must re-roll all successful rolls to hit when firing against a unit that contains the Mirage Standard. Against missile weapons that do not require a roll to hit (such as cannons and stone throwers), all models in the unit containing the Mirage Standard gain a 5+ Ward save.
Building an army? Create, validate and share your list with New Recruit, army builder for Warhammer Fantasy Battles (6th definitive edition) and many more games.
Try the builder