Talking about this sound here (phantasm_plus)

https://gamepedia.cursecdn.com/dota2...ntasm_plus.mp3

Right now, this sound just plays together with the default cast sound as an extra layer. How about making that sound exclusive to the scepter upgrade, make it allied-only, and give it a global radius, similar to how Lycan's Howl sound used to be global? The aghs upgrade does have a global effect, so it would make sense.