As mentioned, the ability to edit skills is related to his new special evolution. He will free up a new "slot" to edit a skill every five levels.
As has also been shown, he can unlock skills of a higher tier by doing this:
If he edits the skill "Acid Resistance" to "Sword Mastery" and sets it to the maximum level, he will release the skill "Sword Hero," and it will stay in his Status.
However, if he edits the "Acid Resistance" skill directly to "Sword Hero" and sets it to the maximum level, it will disappear as soon as he undoes the edit.
In other words, the best thing to do is to get a skill of a lower tier and set it to the maximum level to unlock the next tier. That way, the skill will remain permanently in his Status.
Another thing about this skill:
He can get the skills of the Seven Deadly Sins and release the titles, but the skills that come with the titles won't be given to him.
He will only gain the skills, titles, and abilities that the title gives if he buys the skill.
That's it. I'll keep this chapter updated.