A Soul Attack.
Long Ao chose to use a Soul Attack, a move with a fifty-fifty chance of success or failure.
While a Soul Attack could strike an opponent's soul, it also risked a backlash from their soul. Because of this, Long Ao was always extremely cautious whenever he used one.
But it had to be said, Long Ao's choice to use a Soul Attack this time was the right one.
No matter what, Long Potian was a Peak Taoist Ancestor of formidable strength. While he couldn't defeat the two-faced monster, he was more than capable of keeping it pinned down.
It was precisely because of this that Long Ao had a clear shot at the two-faced monster.
"AHH!"
Although their Integration Technique was incredibly powerful, their combined soul was extremely fragile. This was why Soul Attacks were hailed as the king of all Martial Arts.
