I've added a few things to the lore section about the mansion. Imma put a few more ideas down that I'll work on later 

Divination room

Ritual room

A room that can be set to perfectly display the user's desired weather

Greenhouse 

Dueling room

A room that was supposed to be the perfect napping spot, but instead you fall into a deep sleep the moment you step inside. Generally off limits, but useful for coven members suffering insomnia. As long as they don't forget to pull them out...