Ivern's Backstory is the plot of 2003 Disney's Brother Bear

Which in itself is the plotline of a story archetype almost every culture has brought out since ancient times. "The wicked who gets reformed by forces of nature" is not exactly a rare archetype, and at the same time not really a complicated one. That doesn't mean it's automatically bad, as long it is executed will it's fine.

I haven't seen the lore for him yet but now im guessing that he like destroyed nature then he became nature and had to accept it

I love that movie. The sequel left much to be desired.