[Voice]
Xehanort was one of the apprentices of Ansem the Wise. The experiments of he and the other five unleashed the darkness that destroyed Radiant Garden and went on to extinguish many other worlds. [Having the annihilation of a good part of their universe discussed so blandly probably won't phase him, judging from what he's heard of the soon-to-be-named stranger. He'll keep the rest about Xemnas under his metaphorical hat for now.]