Also something to be on the look out for, those of us who have the same face. Like Katherine and me. Hi, I'm Elena.
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Just because Katherine can seem helpful, she really only is when it's beneficial to herself. She will use people to her heart's content. She's basically a manipulative, self serving bitch who happens to be a vampire and will compel you if necessary. So on top of getting an amulet to protect yourself, you should also have vervain on you, or in your tea. It's more or less poisonous to her and other vampires from our world, as well as makes it impossible for her to compel you to do whatever you want.