I seem to be stuck, I have unlocked the ancient city, talked to robin there, found the burnt teakwood shards, the abyssal flower (also used that on robin). And I progressed all the girls as far as I could, so the recipes I have unlocked are Truth serum, Thunderlust and Faithfull Folly tonic however I am missing some ingredients. The hint from Faust says to explore the ancient city but I have circled that like 5 times and can't find anything.
What am I missing?