"Begin!"
The soldiers quickly stormed inside the Eastern Region with an energy that had never been seen before. It couldn't be helped. They had seen hell today from that ambush and finally could finish everything.
Kai, Ria, and Nathan used that energy to bring all the soldiers and cleared this entire Underground Nest from Magical Beasts.
Kai didn't fight that much in the last region. He had another job after this, so he mostly rested his strength for what would come after. Of course, no one actually disagreed with his decision. In fact, many soldiers from the Reserve Army spread the word of how gallant he actually fought in the front line, especially those from the fronts that had seen his actual strength.
Having Ria as his teacher also elevated his rumor. And finally, after the long day, they finished the battle and returned to the surface.