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Im planning on running the masque/hearld of khorne (with curshers) and fateweaver. I looked at my codex this afternoon and notice that I can only use it once on a enemy unit, but my question is becasue it is a "ranged weapon" do that get cover from this ability?

You only get cover from wounds. So since dance does not inflict wounds they do not get a cover save. You do still need to roll to hit with it because it is a shooting attack.

As above. The entire purpose of ANY save is to stop wounds.