His expression does sombre a little at the mention of him being their opponent. Everything Emet-Selch had suffered, it was for his people... for people like Hythlodaeus. But he brightens noticeably at the idea of introducing them. Perhaps they could find common ground- he's always happy to see Emet-Selch making friends.

"But of course! When? I can take you to him any time." He wonders if Emet-Selch won't be upset with him for bringing Alphinaud to him, but... well, he doesn't want there to be bad blood between Hades and anyone else here if he can help it.