Vale couldn't help but seriously consider this Spell Model.
Well, Celestial Arts are all expensive to upgrade. Although he had enough Energy Points to upgrade them from Level 1 to Level 10 or the Perfect Realm, it would consume a lot if he decided to upgrade four or more of them in the process.
He would have to choose carefully which Spell Models he'd upgrade to the max level…
Anyway, Vale wanted to fully understand the last spell…
This Soul Tethering Spell… The more he read, the more disturbing and fascinating it became.
This spell didn't merely bind a soul. It forced it into a new host, preserving its sentience while utterly stripping it of freedom.
It was a hundred times better than the Slave Mark Spell he had.
The grimoire spared no detail, describing the process step-by-step…
A soul must be harvested within thirty seconds of death. Then, the receiving corpse must not have active will or soul remnants.