I'm making a home brew pen and paper rpg based in a fantasy version of the late Persian Empire, and I'm trying to find information to help me design locations. Any help is appreciated, thanks.
There are quite a few states that could and have been called "Persian Empire", could you specify the period? I'm guessing you mean either the Achaemenid Empire (6th to 4th centuries BCE) or the Sasanian Empire (3rd to 7th centuries CE).
I know a small amount. It's not my specialty, but one of my professors specializes in Judaism in the Persian Period. If you have a specific question, I have access to all of his writings and I can look through it and get back to you (assuming you're referring to the Achaemenid Empire).