Regenerator heals faster than he can be hurt / shrugs off fire, broken bones, bullets

For the first few months of his superhero career Josh Garcetti called himself the Immortal. He could heal from wounds in less time than it took to make them. Fire, bullets, broken limbs—he laughed at all of them. Then he discovered how to share his healing factor with others and he became Regenerator.

Excerpt From Ex-Heroes, pg 39
Peter Clines
https://books.apple.com/us/book/ex-heroes/id585738407