Unlike an Ethereal he can invoke 2 powers each turn instead of one, and most importantly of all (the main reason why you take him) is that in addition to the 12" LD10 bubble, his grants Tau units across the entire game board the ability to re-roll failed morale, pinning, fear and regroup tests. This means outflanking pathfinders, backfield broadsides, deepstriking crisis suits and firewarriors aboard devilfishes all benefit from this, regardless whether they have line of sight to him of not. This is immensely valuable for any large games, where as a Tau player you can now almost guarantee that none of your units will run off the board. This might not sound like much on paper, but in practice this can often decide games.
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