He chose to learn this mainly because he possessed the True Yang Star Flame, which he assumed would make it more powerful than other techniques when utilized.
This Sword technique was the Secret skill of Dan Sword Peak, with a total of three moves, each immensely powerful. Even cultivators at the Golden Core Nascent Soul Realm would find it more than sufficient!
Such Secret skills were never taught to outsiders. Only if the disciples within the peak had an extremely high affinity with each other might there be a chance of passing on a move to a fellow sect member.
As for Outer Sect disciples, unless they had made significant contributions to the Sword Sect or the specific Sword Peak, they would never be taught these techniques.
Secret skills are truly high-level Sword techniques with enormous power.
Since all Six Peaks had been opened to him, Wang Mu, despite not being at the Foundation Establishment Realm, had still learned all three moves.
