He found himself back in that room, and the same angel-like woman who had introduced herself to him last time as the personification of the magic of this place said to him: "Welcome back Priest, now you can not only teleport here at will, but you can also tap into the energy of this place.
Only the Creator could grant you this honor, I'm sure you will make good use of this energy."
Miguel then asked to the personification of magic: "Isn't it dangerous for you if I use this energy, don't I risk contaminating you with impure energy if I ever draw on it..."
After all Miguel was not a saint, and during this battle he would have to kill many Titans and demons.
It was a necessary sin to protect the people he loved, and to protect the innocents that Diana and Lilith's madness had put in danger.