The Ghost Skull Mirror's advancement into an Immortal Treasure was indeed wonderful news, since he had already fully refined it.
Although the Ghost Skull Mirror mainly absorbed the power of Divine Souls and Demon Nascent Souls from Demon Beasts, Cultivators, and the like, converting it into evil spirit energy that could power the mirror, it still consumed a considerable amount of spell power.
When the Ghost Skull Mirror was still a Heaven-Transcending Evil Treasure, that spell power consumption had been negligible to Ye Han, amounting to only a tenth of what he used to unleash a spell at full strength.
But after it advanced to the Immortal Treasure Tier, the spell power it required became staggering. A single use would consume eighty percent of his total spell power, and fully unleashing the Ghost Skull Mirror's Divine Ability would consume even more.
Correspondingly, its consumption of Divine Soul Aura and evil spirit energy had also increased severalfold...
In other words, using the Ghost Skull Mirror now cost several times more than before!
Of course, given Ye Han's current cultivation and Divine Abilities, few opponents could force him to use an Immortal Treasure like the Ghost Skull Mirror.
Only in a true battle of life and death would he bring out the Ghost Skull Mirror again.
He would no longer use it as he had before, even when pursuing ordinary Cultivators of the same realm, to hunt down their fleeing Divine Souls.
There were gains and losses. Although the Ghost Skull Mirror had become much stronger, he could no longer wield it as freely as he pleased.
After slaying the Deep-Sea Ice King, Ye Han did not leave immediately. Instead, he dove back into the depths of these waters...
The Deep-Sea Ice King would not have hidden here without reason. There had