Ava's life, or more accurately death, was changed forever when the nuns stuck the halo into her lifeless corpse, setting off her hero's journey. The supposedly holy object not only revived her, but also gifted her supernatural abilities like walking through walls and Wolverine-level healing. We learn from the Order of the Cruciform Sword, a.k.a. super nuns, that the halo was originally bestowed from atop angel Adriel's head upon Areala, the first warrior nun as a blessing for all of her good deeds.
But alas, nothing is ever as it seems in the realm of the church. This whole gift from god fable was actually a cover-up for the dark beginnings of the order. Adriel, as it turns out wasn't an angel, and he gave Areala the halo (which was stolen by the way) to cover his tracks while on the run. So if Adriel isn't an angel, is the halo embedded in Ava's spine actually a halo? If not, what exactly are the sinister origins of this all-mighty relic?