All supernatural abilities relied on Transcendence energy. Mortals had no way to wield them; only Transcendents, and specifically Transcendents who followed the corresponding paths, could use them.
For example, Bloody Glory belonged to the Fel Energy lineage, so Charlotte could never condense the Eight Knights' Proofs.
Without transforming into a beastman, Charlotte could not wield Bloodthirsty Battle Qi either.
This minor spell called "Evil Eye" was highly adaptable, but it still had to rely on Fel Energy. In other words, nearly all Transcendence energies belonging to Evil Gods and the Fel Energy lineage could cultivate it; other Transcendence energies could not.
It was at least seventy or eighty percent similar to Cat's Mask. It could condense an Evil Eye in the center of one's brow, devour a living being's soul, and obtain part of the target's memories and certain skills.
Well, this spell could not deprive others of their supernatural abilities.
Its primary purpose was not for such trivial matters, however, but to ignite the devoured souls and enhance the power of Fel Energy.
Well, it was very similar to how vampires relied on drinking blood and devouring life force to increase their strength.
Only, one devoured souls, while the other devoured life.
If Charlotte had only just transmigrated here, he might have been thrilled and used it on the battlefield. After all, enemy souls would go to waste if they were not devoured. But he was now a High-Order Transcendent, and naturally knew that every shortcut came with a price.
Just as vampires who devoured too much life would end up with impure blood energy, leading to corruption.
The greatest negative effect of directly devouring souls was absorbing their memories. Those memories would throw the mind into chaos. As for whether there were any other aftereffects, Charlotte did not