Cienan gathers the materials he needs to make Pénélope a body on Chapter 13, Page 5. Aether and blood. Fortunately, Jassart left both behind in the last chapter. Pénélope also appreciates all the aether that you have left behind when you played the lock puzzle.
There is a final piece that Cienan needs and he asks for help for it. If you want to see whom Cienan asks, please vote for Snow by Night on Top Web Comics. This is perhaps Cienan’s most dangerous secret.