[@KabenSaal]

I'll point out that humans aren't the only species to consider. The hain are more prevalent, both in terms of population and (probably) in terms of peoples' characters that you could interact with.

And then there are the rovaick, the ogres, and the dwarves. The dwarves in particular are in a desperate situation since their kingdom was just overrun by a horde of firedjinn, so perhaps that desperation is an alleyway for the ritual that causes Legio to come about. You could talk to Rainbow about that.

In any case you seem intent on using a human and using that specific ritual, but if you were more flexible with either of those choices you'd have an easier time fitting in somewhere without it feeling forced.