☀️ Arselia and Akonia

I don't quite understand how the difficulty works, can you explain?

In the case of locks, a roll is made against your dexterity.

15 (or 10 for gates) against your 18. If you roll higher, the lock opens. If you roll lower, the lockpick breaks and there is a chance of being discovered.

Added 1 minute ago
The room below turned out to be a kitchen, and the room above was a study.