Magic Forums

My Best friend who is normally a very light hearted person has become cold and unemotional. She's been diving down darker paths and she is now drawing multiple dark things. She only draws gore, she finds on the internet like anime characters with horns through their head dripping blood and music guru's with upside down crosses on their heads. and when you get's angry over little things she blacks out and becomes a whole different person and gets murderous and she gets this strength she doesn't even normally have not even when she was angry prior to these situations it's new and when she snaps out of it she doesn't remember any of it and she's very ill afterward . so my questions are, is this possession or mental defect. if possession how can I find out what this spirit is?