Name: Stupefy Duo
Incantation: Stupefy Duo
Year taught: 7
Effect: Stupefy Duo would look like its less powerful variant. When hitting the target it would inflict slowness of the highest degree in conjunction with blindness for 20% of the total slowing duration. The knockback would also be more powerful upon impact.
I found evidence of its existence here: http://harrypotter.w...iki/Stupefy_Duo so I thought it might be an idea if it is something worth considering implementing in the future.