He came to me and started draining me by force. I didnt know who it was at first, so i did some divination and i sensed it was a Ancient entity. I mentally ran through a list of names (still being drained) and i hit on Yog Sotthoth. I had a student i was training do her own divination on it (with no prior knowledge of the necronomicon) and she confirmed the same thing.
So, i tried to peacefully get him to stop by asking. LOL that didnt work. So i threatened him. That didnt work. So i used the force of my will to kill him through soul travel. Hadnt had a issue since