auto revival

“But, but how!? What was all that explanation for about you having a body that would
die if you used magic one more time because your circuits are different because you’re
an esper!?”
“Oh, that was a lie.”
“Uh!?”
“I mean, c’mon, good ol’ Tsuchimikado is fundamentally a liar,” he said, waving a hand
dismissively. “Good ol’ Tsuchimikado’s power is the weak Level 0 ‘Auto Rebirth,’ y’see. I
could use magic four or five times and come out all right, but it’s a real pain in the ass. If
I came out and said it, the Church would demand I use magic as much as I possibly
could, and it gets honestly tiring. Sorry ‘bout that.”
“Ubhaaaaaah!!”
A moment later, Kamijou reflexively hurled the futon covering him at Tsuchimikado.
He dodged it easily, with only a half step’s movement, and continued.

- Toaru Majutsu no Index Volume 4, Epilogue