This fire dragon that suddenly appeared is actually the flame beneath the Dan Shen Sect.
As an alchemy sect, Dan Shen Sect must possess earth flames, which Ye Qiu hadn't paid attention to or known about initially.
It was Wu Yaizi who reminded him that Dan Shen Sect possesses earth flames.
After all, Dan Shen Sect used to be the largest sect with many alchemists, and some rookie alchemists hadn't reached the God Realm and couldn't generate flames to refine pills, making the help of earth flames necessary. Like when Ye Qiu first entered the alchemy dao, he refined pills in the cave at the back mountain of the Jin Clan using its earth flame.
When Ye Qiu was devising the Heaven and Earth Eight Trigrams Array, he had a sudden inspiration: perhaps he could incorporate the earth flame into it as a powerful attack, and thus he began to experiment.
