Once the furnace had been burned red-hot, Lu Xiaotian soon began feeding spiritual materials into it one by one. He moved so quickly that even though Hong Yue had grown accustomed to it back when she was in Yuanling Production City, watching him refine a pill of the Soul-Merging Pill's grade at such speed still struck her with immense force.
Compared with the Buddha-Dust Bone-Washing Pill, refining the Soul-Merging Pill was relatively easier. However, pills of this grade could not tolerate the slightest carelessness. The Formless Mystic Flame entered the Fire-Nurturing Morning Pearl, and after being tamed by the pearl's Nine-Palace Flame-Subduing Formation, its heat beneath the furnace could be controlled at will. In the blink of an eye, the Formless Mystic Flame had wrapped around the furnace layer by layer.
The air currents inside the furnace churned under the Formless Mystic Flame's roasting and rapid changes, even bursting into waves of shrill whistles. Some impurities were continuously expelled from the furnace along with those whistles.
The core of the Soul-Merging Pill was Soul-Merging Grass. The Composite Realm emphasized using heaven and earth as a furnace, fusing the spiritual power of heaven and earth into one, drawing that spiritual power for one's own use, and making oneself harmonize with heaven and earth more perfectly. Under the very eyes of a Composite Realm cultivator, even a Divine Void Realm cultivator would be shackled by the power of heaven and earth if they tried to employ any means. They simply could not draw on external spiritual power. Relying only on the scant dharma power within their own bodies, they naturally stood against a Composite Realm expert as starlight stood against the sun and moon.
Every pill differed in medicinal properties and principles. As for the Soul-Merging Pill before him, everything depended on