I finally found out where my soul originated, thanks to another online test:

You come from Dark Water. You are solitary and
find peace in yourself, or maybe you're
turmoiled but pull off peace.


Where Did Your Soul Originate?
brought to you by Quizilla

Link to test courtesy of the ever scintillating Mind of Mog.

Hmmm.....

"turmoiled but pull off peace?"

(Surely they mean peace®. I will give them the benefit of the doubt this time....)