There's no denying that this is an extremely powerful spirit rune, its might definitely far surpasses any that Lu Ye had mastered before.
However, Lu Ye didn't dare to rashly attempt to activate it because, judging just from the complexity of this spirit rune, the spirit force needed to construct it was vast. With his current 7th Heaven cultivation, were he to construct this spirit rune, he feared that all his spirit force would be exhausted.
This thing was like a trump card; once used, it would be a case of either the enemy dying or my own demise.
However, the name Fire Phoenix did remind Lu Ye of some rather unpleasant experiences.
Previously, when he cultivated the Red Lotus Soaring to Sky Technique, that Cultivation Technique came with two magic and spells, one of which was the Fire Phoenix Technique. Somehow, it ended up being executed by Lu Ye as the Fire Quail Technique...