Instructions
Find a Shadow Priest player on "World of Warcraft" who's willing to battle you.
Choose a character to battle the Shadow Priest. Don't use a character that uses magic, because Shadow Priests use magic. If you try to cast spells, they'll be able to stop you.
Stay close and use melee attacks. If your character is skilled in close combat, you can stop the Shadow Priest from using most of his spells by interrupting his cast before he finishes. Keep this up and the Shadow Priest will go down.