The four of them poured in a huge number of Spirit Stones. Including Xu Yang's mid-grade Spirit Stones, they had a total of seven or eight hundred low-grade Spirit Stones, and the beast head absorbed every last one. Its eyes grew brighter and brighter until, at last, they reached saturation. Two deep-red beams shot from them, striking the Blood Pool below.
The moment the beams hit, the Blood Pool erupted with a boom. The blood within churned even more violently, and a vortex appeared at its center, spinning without pause. At the same time, a flood of red light poured from the bottom of the pool. The beams linked together, forming a complex array.
Xu Yang and the others quickly retreated into the distance, cautiously watching the changes in the Blood Pool. As soon as the array appeared at the bottom, it enveloped all the blood within. With the vortex's help, the blood rapidly compressed inward, while a steady stream of blood continued to pour from the beast head's mouth into the array, replenishing it.
This went on for a full hour. At last, no more beast blood flowed from the beast head's mouth, and the blood inside the array began rapidly dwindling, compressing toward the vortex at the center. Another half hour passed, and all the beast blood in the array had vanished, leaving only a deep-red vortex.
Xu Yang watched closely and saw that the vortex was gradually shrinking. The array was also rapidly compressing inward, slowly merging with the vortex. Xu Yang turned to Fu Tao and asked, "Fellow Daoist Fu, what do you think is happening? Do you have any idea?"
Fu Tao lowered his head and thought for a moment before answering uncertainly, "From the looks of it, it seems to be refining a pill.