Truth be told, we don't know much about them at all. We have a suspect for who's been opening the barriers, but the spirits themselves aren't exactly open to sharing their stories.

[ And the suspect is hard to describe since for the most part, they've just got "man seen fleeing the scene" and a vague description from Seek. ]

But if you're better at protecting than attacking, do that. There are a lot of people who can't do either.