there is no stopping a spirit from attacking you unless you are well prepared... there is a Wiccan protection spell called a 'mirror' once this spell is cast the reciever will be 'impervious' to attacks... i put quotations around impervious because the only attacks it dispells are physical attacks and posessions. you can still feel their presence and their anger (if applicable) but any physical attack the try on you bounces away from you. Might be something to think about. I have to angry entities in my basement and they attacked me (and only me) everytime I went down there... a fellow follower of Wiccan religion cast the spell upon me and even though I still get creeped out downstairs I am no longer coming back upstairs with bruises and scratches

on that note where would I be able to buy a crystal? I have looked in the usual places (which are few and far between) and only find imitations. I need a real one to test my theory that the entities are malicious and not just angry.