After casually dismissing Mark and Saru,
Charles began studying the three fourth-circle spells.
Since there was no one from whom he could purchase insights through Wu Duo Duo Mall, Charles could only begin researching these three fourth-circle spells from scratch.
Starting from fourth-circle spells, these spells were no longer simple finished products.
They were merely frameworks, requiring the user to fill them with the necessary rule runes.
For example, for Flame Armor, Charles could pour the complete fire rules he had mastered into it.
As for Demon's Claw and Abyssal Disintegration, he could infuse them with Abyss rules.
Of course, he could also continuously adjust them and inject all the other rules he had mastered into them, but that would require far more adjustments.
Spells also required compatibility.
Fortunately, Saru had heard Mark mention that the one purchasing these spells was a Balor, so the spells he selected were relatively compatible with the power Charles currently possessed.
Now that Charles could not rapidly master these spells through Wu Duo Duo Mall, which one he learned first became particularly important.
In the end, Charles chose to learn Abyssal Disintegration first.
It was the most powerful of the three fourth-circle spells, and both the complete Abyss rules and the complete fire rules could be integrated into it well.
It could increase Charles's combat strength to the greatest extent.
He devoted all his energy to studying this spell.
Unlike other demons, Charles could perfectly master the analysis rules, which gave him faster learning ability when studying fourth-circle spells as well.
After spending several months, he had already learned his first fourth-circle spell. Though he had only just learned it and needed more time to cast it in battle,
it was enough. The power of this spell was more than sufficient.
Flying through the