Hey, with my "evil entity" in my group, eventually two others barred him up. I added sound proof glass. For me, it was important to acknowledge his existence without shutting him out entirely (which I'd tried before and didn't work). This barrier works. Also, he was counteracted by the other members' care. This help to lead to a personal decision to be kind to myself, as this guy was/is GOOD at turning my own thoughts/actions against me. Removing that foothold and others he had is also huge.