"I actually succeeded!"
Feeling Rainbow's admiring gaze upon him, David Jones's mood was quite subtle.
He dared to tell the Firewood Kylin that he could solve the Bodhi Tree's mystification issue because he had some degree of confidence.
Cosmos once said that the Mystery Power found in a Semi-Fiend is a force higher than the Arcane Force and at least on par with, if not slightly superior to, the Immortal Power, allowing the Mysterious Beast inheriting a Semi-Fiend's meager power to have an almost overwhelming advantage over legends and those below.
And to purify the Mystery Power that has infiltrated a body, one must counter it with a power of the same level, which is why the Firewood Kylin dared to claim that only an immortal being could save the Bodhi sapling.