Twelve-Winged Dark Seraphim
I am always bewildered by authors that don't think things through. No technology works on that world. So how did the portal open? Mechanical things don't work? So gunpowder is no longer flammable. So by his logical "technology" is anything not natural. So rubbing to sticks to create fire would not work because that is technology.. I know its nitpicking but how could they go back and forth and redevelop martial arts for 100 years, they should have lost contact to the old world once they came over.