C137 Body Burning Pain.

Lu Shaoyou cast the Paramita Spirit Grass into the Fire Dragon Cauldron, persisting in his refinement. The grass, pure as driven snow, brimmed with potent energy. Once inside the cauldron, its leaves withered, but its core remained resilient, radiating a blinding white light, as if resisting the flames' attempt to refine it.

Such resilience was expected by Lu Shaoyou