The Ethereal and all Tau units (not Kroot, Vespid, or drones) with line of sight to him may re-roll any Morale checks. This includes passed Morale checks. The re-rolled result stands. Any If the Night Fighting rules are in use then roll to determine the distance the unit can see. Any Tau unit joined by an Ethereal caste member becomes Fearless.
Building an army? Create, validate and share your list with New Recruit, army builder for Warhammer 40,000 4th Edition and many more games.
Try the builder