Godzilla: Age Of The Avatar

A Godzilla x Korra story where Godzilla is a being that lived through multiple Harmonic Convergence with Raava and Vaatu.
Before humans lived on the Lion Turtles they lived on the ground but then the entire human world was destroyed and the remaining living humans were given protection by The Lion Turtles which granted them power to survive in the newly formed Spirit Wild from the great Cataclysm that destroyed the planet surface.