The cloud of blue energy didn't change as it asked its question. A wave reverberated out of it containing its intent and message. The question is harmless. It just looks like the demon god is curious about him. A lot of people are curious about why he came in his main body too.
Aeternus replied calmly. "It wouldn't matter if I came with my main body or not. I am doomed if a demon God wants to get me. Besides, the esteemed demon God of wrath swore to protect us from other demon gods."
What he said is true. It doesn't matter in which form you appear before a demon God. Your death is all but certain. Even the demon lords are not safe. If a demon God can forcefully send a message to all the rulers of the abyss within their plane, then a demon God can reach demon kings or demon lords no matter where they are through their avatar of sin energy.