People are in Star Iron, and the sky fire is out of its sheath at the beginning

As the chief scientist of the Fire Chaser, Ron found himself waking up in the Black Tower Space Station after defeating the Herrscher of the End in the pre-collapse civilization era.
Then, he was surprised to find that the Heavenly Fire Holy Judgment he used in the previous civilization also appeared next to him——
In short, this is the story of a genius scientist who holds the Heavenly Fire Sage and brings disaster to the Star Iron world.
"I will defeat all enemies, even if it means risking the life of the Black Tower!"
"Heavenly Fire! Out of the sheath!"