My impression is Belial is warning you to take control or there are things that could bind you - he is the breaker of chains.
Party because this dark energy seems to have a clear cause, and Belial can be aggressive but not dark or malevolent, he’s larger than life, very bright and yang as beings go. But we know doing magick lights you up and attracts all sort of nasties - that’s why you banish not necessarily to get rid of who you just called but to drive off parasites, “shadow beings” etc attracted by the activity. Unless you put up wards to stop them which it sounds like you don’t.
So here is the obvious red flag for this:
and
So you left a mess for the people at the old apartment and now you’re dirtying up a new one? 
So, yeaaah - maybe not for long with this MO. I would say Belial or whoever’s using his symbolism is doing you a solid, and warning you to fix your spiritual hygiene asap. They should not have noticed you or been able to come that close without your permission, so your whole life could be wide open for anyone to play silly buggers with you.
Sounds to me like a warning from your subconscious that you’ve already attracted something you don’t want around, and it may have followed you, who knows? If you like the peace and want to keep it like that going forward, you probably want to maintain it with a little more housekeeping 
Here’s some more tutorials we have for this: