“Real,” “egregore” - I’d be interested to know how people who feel certain of the nature of gods and demons, on either side of the debate, can explain these kinds of things:
There are hundreds of results of different cases if you search brain damage personality change and terms like that. You’re all just one solid blow to the head away from being completely different people. For the rest of your life!
Things like this are even more of a headfuck:
And it’s not just the brain that can do this:
Source & full story: blogs.unimelb.edu.au
And we think we’re “real” enough to decide who and what else is… 
Some of my best friends are egregores! 