Sonamy: Haunting of the Ritual

Sonic and the gang were at Amy's house. Doing friend like things. Sally had the idea of doing a "ritual" for fun to see if anything haunting happens. Amy was not for it but they decided to do it anyway. Little did they know things did happen. After the ritual, things didn't start to kick in until after they returned back to Amy's house leaving Sally to be main host of the Ritual as it possesses her. When the rest return they see the changes. Will they make it through? Will something happen? What will happen to Sally?

Warning: violent and lots of bloody scenes.