I wonder what Yuan could have gotten as a power up from that Deamon core...
I just wonder what cool Deamon power he could have gotten! Immortality? 2000x Cultivation speed? ULTRA REGENERATION(Date Slime, Orc lord)? Demonic strength?
Bet if he ate those crystals he would get a super cool regeneration ability or did he forget that he has the Heaven Refining Physique... So refining impurities of a demon core is nothing for his physique for sure...