Lucifer chose to casually ignore his son having energy that would make early Primogenial realm existences jealous despite merely being a Monarch realm.
Turning back to Arthur, he analysed the seal on Arthur as he spoke.
"A 'True name Seal', huh?
That's quite a risky action, don't you think?"
"I was, but it was also the best I could do at the time. I also made it so that he could release the seal anytime he wished, but he's not foolish enough to do that now since he still cannot contain that extra energy."
"You also seemed to have accounted for the fact that the 'extra energy' was increasing too."
Cattleya nodded in affirmation to the words of Lucifer who was analysing Arthur's true name seal that left the boy's body with an amount he could contain without it breaking down.