Rimuru/Ciel Volume 23 light novel.

"After Milim, now it was Velzard's turn.

Why are the True Dragons always so troublesome…?"

"Swallowing that thought, I activated my 'Instant Teleport' and headed to ancient Eurasia, with Diablo by my side…"

Guys, according to Rimuru, he's going to support Guy. Will we see Rimuru use Azathoth's predation on Velzard in volume 23? According to volume 20, because Ciel understood the power of the "King of Justice Michael," she was able to duplicate and negate its influence on Milim in volume 20. So it's possible to use the "Regalia Domain" on Velzard now that she's irrational. If someone distracts her for a moment or if Rimuru arrives by surprise and uses the Regalia Domain at that key moment. Now, regarding Velzard's damaged core, Ciel can use the supreme domain of the King of Justice Michael to try to create a direct connection to her soul without needing to predate her. She did this with Zelario without needing to predate him.

《It was very easy. The 'Analyze and Evaluate' was done on the 'King of Justice Michael', which contains the 'Supreme Domain' that allows absolute control over angelic abilities. I simply used it.》 Note: These are Ciel's lines.

What do you think? It's just a theory, but who knows? Haha. Personally, I hope Rimuru doesn't use Azathoth in front of Guy.