The eye didn't answer. It just watched everything as it always had.
The cocoon of dark energy around Rion hardened into layers of pitch-black, and the insides were filled with a pitch-black liquid swirling chaotically.
The strings of fate penetrated through it and continued to enter his eyes; however, Rion no longer had a look of disastrous agony. Instead, he was in a state where he could feel nothing.
Although Noir couldn't see what was happening within the cocoon, he could feel the changes in the rhythms of Rion's heart.
At rest, the human heart on average beats about 1 to 1.5 times per second, a demon heart beats twice as fast, and a devil heart beats five times faster than the latter.
Thus, the creation of demonic energy in a devil heart was nearly instant, and at the moment, Rion's demon heart was being evolved into a devil heart.
Noir could feel Rion's heartbeat rising not in a chaotic, but orderly manner.
