"We should head back first; being here feels extremely uncomfortable," Xi Fei said to Zhao Guang.
Zhao Guang nodded and then looked at the flames atop the altar. "Spread this thing out."
Xi Fei acknowledged, then waved her hand over the origin of the flames on the altar, and the flames dispersed. It wasn't a true dispersal; rather, Xi Fei had fully integrated it into the Hell Power system.
It's just this cluster of evolved origin, not Xi Fei herself, that was merged.
This cluster of power was originally under Xi Fei's control, and henceforth, the evolved Black Flame Demon would be absolutely controlled.
But now that this cluster of power was dissolved, Xi Fei lost absolute control over the Black Flame Demon, retaining only relative control. In other words, only those who appear before her could be controlled by Xi Fei.
Moreover, she can only exert absolute control when the opponent's strength is inferior to her own.