Indeed, Nature Deities possess the ability to regenerate their bodies and can live for nearly a hundred thousand years. Their souls are incredibly resilient, but they are not immortal.
With a swing of his baseball bat, William ended Reginald's life right there.
The surrounding rubble fell to the ground, dust settled, and the crowd from the Soulmancer Academy erupted in excitement.
"Damn! That was awesome!"
"Does that count as an instant kill?"
"Maybe not! The guy who died seemed pretty powerful."
...
The students of the academy were exhilarated. It felt like a group of aliens wanted to attack Earth and enslave humanity, and these aliens were incredibly strong. Just when they were about to lose hope, a superhero appeared and saved them.
This superhero, dressed in white, tall and upright, wore a mask that added to his mystique.
They probably all forgot that when William first appeared, they were full of disdain and mockery.