Not to be afraid to use black magic
"Hatred and malice and anger I feel.
My insane side has been fueled by you
Vengeance is just
And you are worthy of my punishment
Feel the force of my lost pain
Feel the force of my lost anguish
Let terror haunt you
Strip all defenses from you
As long as there is darkness in my heart"
Say this three time, it's your choice how loudly but your voice must show your contempt. Send all the energy you put into the air towards them and form a prison with it around them, then sink it into their soul. When this is done walk away, the curse is set once you are out of their eye shot.
It doesn't unset the curse if they see you again after casting this.
If they have a shield up or try to block the spell, make it be consumed by the energy you put into the air.
I'm not sure if this curse can be sent back to you or not, be careful.
This spell is quite draining, make sure you have a lot of energy to use