Help?!

I am trying to find a story I read a while ago, but i cannot remember the name of it for nothing. It involved Avenged Sevenfold and a witch ( i believe her name was Krissy or Krissi); she was a lunar (moon) witch, but I know it was a series type thing but now i cannot find it for the life of me. Please i begging someone to help me, it's driving me crazy cause it was one of my favorite series to read......