When the three souls merge and the seven spirits return to one, the cultivator's divine soul becomes forged, and their Qi Sea in the Dantian is no longer a limitation to the martial artist. The strength of the divine soul is the ultimate standard for measuring a Fierce Realm warrior.
Because in addition to a stronger physical body and increased spiritual energy, Fierce Realm warriors have the ability to integrate their divine souls with their physical bodies to unleash a unique Spirit Art. Some particularly powerful divine souls can even multiply the strength of the Spirit Art by several times.