Aibo was utterly engrossed in researching Slayer Magic, like he had gotten a fun new toy and was completely hooked on playing with it.
He took back what he had said before. Devil Slayer Magic provided no small boost to the Seven Sin Apostles.
Although the Apostles already possessed the ability to convert emotions into Curse Power, the other ability—devouring elements and converting them into magic power—was even more useful.
The [Slayer Magic LV1] Aibo had obtained was actually the ability to create "Slayer Cores."
After repeated research and experiments, Aibo successfully mastered the new technique of producing "Elemental Slayer Crystals."
Thus, Aibo implanted an "Iron Slayer Crystal" into [Pride], "Fire" and "Lightning" crystals into [Wrath], an "Earth" crystal into [Gluttony], "Water" and "Ice" crystals into [Envy], and a "Wood" crystal into [Lust]...
As for [Sloth] and [Greed], Aibo's attempts to create crystals had failed. Whether it was a crystal representing "sky," "time," or "space," he had been unable to make one.
Aibo guessed that it was because his [Slayer Magic] was only LV1, so he could currently only create ordinary Elemental Slayer Crystals.
To create Slayer Crystals involving other concepts, he would need to raise the level of [Slayer Magic].
But this was already enough. After receiving their respective elemental crystals, the Seven Sin Apostles not only gained resistance to those elements, but also gained another way to replenish their Curse Power, greatly increasing their strength.
Aibo sent [Wrath] to challenge Natsu and discovered that Natsu had actually fallen into a disadvantage!
[Wrath] could devour Natsu's fire, but Natsu could not devour [Wrath]'s Curse Power flames.
After being transformed by the "Fire Slayer Crystal," [Wrath]'s Curse Power flames had also gained Slayer properties. It seemed that the Dragon Seed within Natsu rejected those flames.
Aibo's judgment was... the two