This thing was not concocted during the Yellow Emperor's time, it had existed for ten thousand years prior, discovered by them and placed in the tomb, with each containing a ten-thousand-year lamp. Now, there was still more than half of the lamp oil remaining, the flame was even and steady, a silent foot-tall flame, continuously burning quietly, not even the fierce duel just now could shake the flame in the slightest.
The oil was very clear, and Shi Feiyang had long planned to use this oil for the sacrificial refinement of the Purple and Blue Duoluo Fire.