“I did not obtain anyone else’s help. Time was simply on my side,” Fiamma said.

He had not opened the gate of heaven. He was simply such a holy existence that the world around him changed to become like heaven.

[...]

“As a result, the heavens are filled with Telesma while the earth is not. That massive power will now rain down like the flowing of an electric current. …Simply put, the earth will be filled with light. It is via a different route than I had intended, but the result will be the same. The change is still continuing in this world.”

“Do you understand what is going to happen?” Kamijou said while grinding his teeth. “That’s a huge mass of the same energy that makes up an angel’s body. If that falls down to the earth, a ridiculously huge explosion will spread across the surface before any kind of change can take place!! It was the same with Misha during Angel Fall. If power that massive is allowed to rage without being controlled, it could easily destroy all of human civilization!!”

“Yes, it is unfortunate, but only for you. Given the amount of power, at least the entire continent of Eurasia will be enveloped by the light.”

Toaru Majutsu no Index vol.22