Zian Yi began using as much corpse Qi as was needed to extrapolate the Corpse Flame skill as much as possible.
After just a few minutes, he was done. The corpse flame skill now had nine stages.
He did not stop at just this. After completing his extrapolation and his knowledge could no longer allow him to extrapolate the skill any further, the option to upgrade the skill appeared.
He chose to upgrade. The battle axe glowed with a crimson light that covered the entire room.
A maid who had been passing through the hallway saw the light coming from the gaps on the door. She walked closer to try and figure out what was happening and this was when her mind went silent. She could not think about anything and her brain could not even maintain her body. She forgot how to breathe and fell on the wooden floor. She died a few seconds later. This crimson light was not meant for the eyes of the living.