[private]
Yeah. Well. Here's the other bit of advice that no one likes hearing, but I had to learn the hard way for myself: Everyone needs to get over themselves. No matter what their last name is.
So. You've chosen door number two - the mirror dimension. A pocket safe space. We've been in an alternate timeline already, and you're now aware of it. You're a copy of an original you that's been here already, sharing the same life experiences thus far. That's all.
That dimension is just one facet of time and space, and any master of the mystic arts in any parallel timeline can create one for you. It's where threats are kept contained for a period of time, so nothing destructive happens in our collective reality. I can push you into it, but after that you're on your own until I remove you again.
I do know that, it being made of magic, means that any magic can be amplified or drawn from that dimension for use.
Before I offer to do this, what is it that you're using it for, precisely?