Thunder Spirit did not refuse. He was indeed old, and it was becoming difficult for him to control the recoil of the ripple power. If there truly was such a thing as eternal life...
Mu Ling left, saying that next time they met, he would bring Thunder Spirit to Paradise to enjoy an infinite lifespan. During this period, although Thunder Spirit coveted immortality, he still harbored apprehensions about the eeriness of the entire event.
Thus, he summoned his most trusted subordinate, Mongki.
He narrated the entire sequence of events to Mongki.
He himself disappeared suddenly one night, half a month later.
After three full days, a critically wounded Thunder Spirit suddenly appeared at the doorstep of Mongki's residence. He urged Mongki to flee, to stay far from the ripple master organization, and from the entire Immortal Islands. He also handed over his Supreme Ring to Mongki, with his last words instructing Mongki never to seek revenge for him.