Soul fusion of three, and the unity of seven bodily souls would forge one's spiritual soul, no longer being constrained by the warrior's Sea of Qi. Instead, the strength of the spiritual soul became the ultimate standard to measure a warrior of the Fierce Realm.
For powerhouses in the Fierce Realm, apart from possessing much stronger physiques and Spiritual Energy compared to those who had just transcended the Mortal Realm, the explosive power of Spirit Arts resulted from the unity of the spirit and body exhibited miraculous effects. Some particularly potent spiritual souls could even amplify the power of Spirit Arts several folds.