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I was thinking, which is scary in itself, that when nocturne pops his ult wouldn't it be awesome if you saw eyes looking out from the bushes all around you. Or some random movement in bushes where there aren't eyes. Shadows running in the fog of war at the limit of your vision. Also when nocturne jumps in he has an army of shadow creatures traveling with him, they are fake and do nothing but the scare factor would be much higher in my opinion.
I don't even know if any of that is possible, but it would make an amazing addition to his ult, and bring some depth emotionally to the victims. I know it would get my heart pumping.