[Xemnas saves his fury for things he hasn't done, and worse than mild exaggeration. What had been told to Lightning wasn't fantastic, but also wasn't damning enough to require being called a lie.

It told him there was something else, and far more severe.]

I can guess. I found it while reviewing a conversation I had with an intelligent young lady who'd been doing a small survey and asking why mammals in this world can lay eggs. I suggested monotremes, and we had a very pleasant chat. Others had answered her as well.

[He gestures with the pokegear.]

Given that's where Demyx's mistaken confession arises I imagine it was she he was speaking to, and possibly also lying to. There may be others but of those, I don't know. The question is how to go about asking after it. She seems a little too canny to just hand over whatever someone asks for.