My therapist: Kotodama Asta isn't real, it can't hurt you.
Kotodama Asta:

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My therapist: Kotodama Asta isn't real, it can't hurt you.
Kotodama Asta:
“There’s no need for you to know.” - The genius of this scene
I can’t stress how fascinating and compelling this short meeting between Asta’s and Ronne’s Devils are. Look at Ronne’s Devil, defeated. He doesn’t just spend his last moments futilely screaming himself to death like the “final boss” he is, he himself is suddenly introduced to another devil that he’s unfamiliar with and possibly even intimidated by. A whole other entity that he seemingly didn’t account for.
Think about that.
Ronne’s Devil is the entire reason every major plot point related to the elves in Black Clover ever happened: the main narrative in the entire series up to this point. He masterminded the genocide of the elf tribe, planned for Licht’s corruption so that he could obtain a body and in the process unintentionally created the very legend of the first Wizard King, and in the present, illustrated the human-elf war itself, the largest scale battle the Clover Kingdom has waged to date. Ronne’s Devil is even, to some degree, partly responsible for the entire Magic Knights’ existence and the culture of the Clover Kingdom itself.
He is a prime example of the man behind the man. He orchestrated everything. Everything. There is no overstating this one being’s importance to the narrative of Black Clover as we know it.
But there’s another devil, and he couldn’t care less.
Not even Ronne’s Devil knows who this is. This absolute mastermind doesn’t have the slightest clue. He recognized another devil resonating within Asta’s grimoire, but nothing beyond that.
Asta’s Devil is a newer devil, if him calling Ronne’s his “senior” is anything to go by. We don’t know how or why exactly this devil ended up sealed in Licht’s, now Asta’s grimoire when it gained that fifth leaf, but it did. And what about Ronne’s Devil? The entity responsible for putting him in that grimoire?
Done with. As good as dust in the wind.
Asta’s Devil doesn’t even give a reason for not revealing his identity to a being that’s supposedly greater than him. He acknowledges his “senior” and then talks down on him. Talks down on the orchestrator. Either due to plain arrogance, or possibly having key knowledge Ronne’s Devil also doesn’t know, Asta’s Devil doesn’t give the faintest glint of respect to his dying kin, or even deign to properly introduce himself. If he was somehow an older or superior devil, his attitude would be justified. If his power, Anti Magic, could single-handedly overcome Kotodama Magic, the power to make almost anything happen with simple speech, his attitude would be justified.
Asta’s Devil is just punching up the hierarchy for shits and giggles, and nothing more. Because he can.
It doesn’t matter what you did or accomplished. It doesn’t matter how big of an impact you’ve left on the land of the Clover Kingdom, or how impossibly strong your magic is, or that you could have destroyed/conquered the human world by yourself if not for these particular individuals. As of this moment, you’re dead. You’re the MOST important character in this stage play that you yourself wrote, but that doesn’t matter now, since you’re about to disappear.
You’re just the loser. End of story.