I opened the cave and together with Galiene we defeated Captain Ceres. I am asked to defeat him again at midnight but I can't find his place.
In this game, it's important to know how to use the built-in help system: from the library, the bartender, the fortune teller, and map hints, as well as hints from NPCs. And usually, everything is clear.
If you have a mirror, use it after midnight.
