This weak aura works just the same as any weak aura that shows grand ILLIUSIONS with image file on the nameplate.
https://1drv.ms/u/s!AtEo0rBNw0P3k0Un9toBR5J7MHKN?e=YuSVKu here you can get the Img file and the sound file. Put the img file in \World of Warcraft\ retail\Interface\Addons\Icons
And put the sound file in the \World of Warcraft_retail_\Interface\Addons\SharedMedia_Causese\sound
If you have none of the SharedMedia addons, you can download them. Or just crate ur own folders!
Enjoy!