Seven days.
For seven full days, Lu Yang had secluded himself in Bandalsburg Prison to cultivate. At this moment, his entire body was enveloped in a red cocoon of light. But upon closer inspection, one would discover that it was not a cocoon at all—the intense red light radiating from Lu Yang's body was simply so powerful that it seemed to have taken tangible form.
Inside the cocoon of light, Lu Yang's appearance had completely changed. Unlike his previous advancements, before reaching the Flame Lord stage, his most important advancement had been from a Fire Archmage to a fire demon, transforming his physical body into a body of magical elements.
The Fire Spirit stage after becoming a fire demon had merely been an enhancement of that magical elemental body. This advancement to Flame Lord, however, would bring him into a new realm called Soul Core Manifestation.
The hard Soul Core that had previously existed within his mind would change from a solid crystal form back into a flowing liquid. After flowing through every corner of Lu Yang's body, it would solidify into Lu Yang's form.
There were two most difficult parts to this. The first was melting the Soul Core. The cultivator needed to control the temperature personally, and the Soul Core was connected to the blood vessels in the brain. The slightest disturbance would cause unbearable pain. The pain of reshaping the Soul Core often lasted for days or even weeks. Those who could not endure it might die outright, and even if they were saved, they could fall back to the fire demon stage or even the Great Mage stage.
If one endured the first trial, one would enter the far more dangerous second trial: letting the melted Soul Core flow through the entire body before solidifying it