This is a collection of 3 auras:
Void Eruption - Amp (text) (Shotgun cocking sound)
Void Buff (text) (Big gunshot sound)
Void Over (text) (Shells hitting the floor)
Sound files can be found here:
https://drive.google.com/open?id=0B_1Vs8F4X9a3V2xCSDhTWm5CN1k
Place them in here:
B:\World of Warcraft\Interface\AddOns\WeakAuras\PowerAurasMedia\Sounds
Video from @DJRiff https://www.youtube.com/watch?v=ywWUQuciADA