I traveled through time and space, and I exchanged my life for krypton

I traveled to the immortal world, but found myself in an old body.
My life span is about to end, but fortunately I can exchange my life by krypton level.
I retreated from the eighth level of Qi Refining to the seventh level of Qi Refining in exchange for ten years of life.
Although my realm has retreated, I am proficient in magic and my strength has not decreased.
The evil disciple is unfilial and colludes with foreign thieves...