Cyrus didn't even look surprised by the vanished cyanic skeleton; the Yin and Yang Fire was the mythical fire that could only be created after mastering both Yin and Yang. But not even then can someone control it like Cyrus. He had unknown years of experience with this fire.
Furthermore, because of his physique, the Yin and Yang Fire was like breathing air to him, and if he didn't have Primordial Origin Yin and Yang Physique, he would've suffered a terrible backlash just by creating a small spark of Yin and Yang Fire as a mortal.
'It seemed I used more than fifty percent of my current energy reserve just by manifesting the Yin and Yang Fire for an instant. Well, not bad, I guess. My energy reserves are equivalent to a Qi Core cultivator. Unbelievable, really.' Cyrus's eyes shimmered in ecstasy.
The system nonfiction rang at this moment,
______
[You have killed 1 Undead (Mortal Tier-17)]
-Reward(s):
-SP: 70
[Spirit Points (SP): 70/1,000]
-LXP: 0