A Private Residence
One might question as to why Emperor Feng would grant such a title to Lin Mu. Even if he had saved the life of his son and many others, there were alternatives he could have taken.
In fact, Emperor Feng had never thought that there would come a day he would ever grant a title like this to anyone. But he didn't doubt it for a second and granted it to Lin Mu.
This was due to the fact he knew, if Lin Mu really wished to destroy the Dao Wind Empire, he didn't even need this title. Just the Celestial backing him alone could do this with the wave of her hand.
Plus, it was Lin Mu's reference through the Saintess that allowed his grand daughter to be taken in as a disciple by the Ever Spring Mistress. That alone was priceless, and the alliance obtained through it was worth even more.
With how much Lin Mu had helped them, there was no hesitation in granting him the position of the Imperial Imperator.