The burglar says it can transform me in the beastiary, but when I lose to it the game puts Sanya back to human before teleporting me back to a campfire without transforming her.
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Right now the only way in is to brute force the secret code. In the Sciawin Estate, you can find a hallway which has a set of six candleabras. Examine them in order 313412 to open the secret door.
I will be adding some NPCs and ways to find the password in the next version but I'm not going to make you wait.