When one breaks through to the Soul Forming Realm with the Ten Thousand Swords Soul Technique, their Soul is in the shape of the sword and usually, it's only one Soul. For Wan Shui to have two Sword Souls is a big deal because it means in the same realm, no one is his match and can control two swords at the same perfectly. Use Sword Intent and Sword Arts and Techniques without issues.
With the Ten Thousand Swords Soul Technique, Wan Shui can either use swords with both hands or with Soul Power or use one sword with his hand and the other with his Soul Power but Soul Power is faster, stronger, flexible and unpredictable.
In the Soul Forming Realm, there's one Sword Soul, in the Soul Transformation Realm, there's four Sword Souls, in the Unification Realm, there's sixteen Sword Souls and in the Mortal Shedding Realm, there's thirty two Sword Souls.
