The value of a soul-defense type sovereign-grade immortal weapon is comparable to a purely defensive king-grade immortal weapon, yet someone who possesses the former would never exchange it for the latter.
In fact, even if it were a purely defensive king-grade immortal weapon nurtured by an immortal emperor powerhouse, the owner of a soul-defense type sovereign-grade immortal weapon would still not trade it.
This is simply because soul-defense type sovereign-grade immortal weapons are exceedingly rare. Not only is their forging difficulty immense, but the materials required are exceptionally scarce.
Chapter 3014