Have you had this experience before? It sounds like a hallucination or paranoia. They can be terrifying, I know. It really helps to try to ground yourself in reality and do reality checks such as rationalising the likelihood that this is real. Most likely there is no evil presence and you are safe. If you can't find a way to feel safe and still feel threatened perhaps talk to your T and/or pdoc.

My T helped me today with 'shadows' that appear at my front door then leave silently. They freak me out. He helped me not feel like I am losing my mind but to instead try to see them as non-threatening. He calmed me down and helped me worry less about the phenomena. Along with that he suggested I take more Abilify and tell my pdoc tomorrow about it in hope he can help me from the medical perspective.