Do you want to get this amazing spell effect in WoW?
You only need to input command: /console SpellEffectLevel 5000
You also need to set Particle Density (in Video option) as high as possible.
If you want to cancel it,
Please decrease the value "5000" to 5 ,10 or 15 ... the default is 9 tho.
below are some screenshots of when the value was set to 100,000 o_O