For the Fire Folk, the form taken by the end of magic was far more violent than it was for the Earth Folk and Wind Folk.
Of course, for certain relatively small stars [here, stars with masses far below that of the sun], the decline in thermal effects caused by excessively low spiritual energy density—or simply insufficient thermal energy—might not ultimately result in a supernova explosion. Instead, the celestial body that had burned eternally could go completely dark, falling from a star into a gas giant.
But on larger stars, a supernova explosion became inevitable.
Once a supernova explosion occurred, the entire celestial body underwent drastic changes. Whether the star ultimately became a diffuse nebula, a neutron star, or a white dwarf, its environment would differ enormously from that of the original planet, and its elemental composition would be completely different. Fire Folk would become incapable of being born there.
And if the final product of the supernova became something like a pulsar or a black hole, then even Immortals would perish, body and Dao alike.
On the other hand, this process was difficult to reverse.
For the Earth Folk and Wind Folk, they only needed to continuously seize small celestial bodies with high spiritual energy density from the universe and cast them onto their home planet to keep extending its spiritual energy environment.
The total amount of spiritual power a rocky planet could possess was very small. As long as the biosphere did not go extinct, spiritual energy density could naturally recover after tens of thousands to hundreds of thousands of years.
But stars were completely different. Even if one threw every celestial body within the Great Sun Territory into one, it would only be a cup of water against a cartload of fire compared to the star's immense