The Fire King's injuries were extremely severe, and after being left to fester for an era, even his Origin was crumbling. His Dao injuries had long since penetrated to the marrow.
Under such circumstances, healing completely and returning to his former peak was naturally no easy matter.
Even He Mu could not remove such injuries in a short time.
However, clearing out the "filth" inside the Fire King, removing some remnants of the Undying Kings' Great Dao, and helping stabilize his injuries was nothing more than a trifling task for He Mu.
He spent three full days using supreme, forbidden methods to dissolve all the hidden measures the Foreign Domain's Kings had left inside the Fire King during the great war of old.
With that, although the Fire King's injuries remained severe and had not healed, they were no longer fatal. Though he could not recover immediately, simply continuing to hold on was no longer difficult.
At the same time, after careful consideration, He Mu also imparted a modified version of Nine Secrets: Zhe to the Fire King.
Following He Mu's modifications, Nine Secrets: Zhe, which the Longevity Heavenly Venerable had created long ago, had truly become a supreme immortal art of longevity. It was especially effective in matters of life and healing, in no way inferior to the True Phoenix race's profound mysteries of Nirvana through fire.
It could be said that this immortal art was exceptionally well suited to the Fire King's current condition.
His injuries needed precisely this sort of slow nurturing, gradually replenishing the life Origin he had lost over an entire era until he was once again brimming with vitality.
As it happened, the Fire King himself was somewhat unusual. He was born human, but was not pure-blooded, possessing a considerable amount of Vermilion Bird