Ssayth looks at Lydia with an expression as emotional as a snake's (not very emotional, by mammalian standards). "Yesss, that isss what I sssaid. Ssshukak and Ilthane are alliesss, but it isss not good for the Twisssted Branch."
"Wormsss, all sssorts. Food ssspoils too quickly, the earth vomitsss rot and decay, and alwaysss there are wormsss there. I have ssseen all colorsss, but many are green."
Frederick successfully assists Lydia's Knowledge Religion check - feel free to write dialogue to that effect.
Frederick's Diplomacy check moves Ssayth from Unfriendly to Indifferent.