Even the poison he was most obsessed with in his past life didn't interest him much.
This time, what was attached to the sword energy was the Liuli Buddha flame, a flame evolved during the cultivation of the Great Liuli Sutra. The bright Liuli flame is very similar to the Five Elements flame, but it most noticeably restrains the power of Underworld strongmen!
In battle, everything often passes in an instant. Using a fashionable term to describe it, that would be inspiration! Just as Xiao Qiang was able to blend the Five Elements flame into the sword energy, that's inspiration. In the instant he struck, he suddenly thought of this idea and directly acted on it.
And using the Liuli Buddha flame instead of the Five Elements flame is also a form of inspiration.