I agree it's unclear, unfortunately space constraints meant I couldn't figure out a good way to explain it better. Here's how it's supposed to work:
Pick the room you want to add details to.
If it's a 1, 2, or 3 look at it's highest neighbor. Check the table under  and use the detail that matches the highest neighboring die.
If it's a 4, 5, or 6 look at it's lowest neighbor. Check the table under  and use the detail that matches the lowest neighboring die.
So as an example, if you use the die layout that's on the card, the Throne Room (two 6s) has a 3 as it's lowest neighbor, so it's "Pristine".
Or the Jail die (the 1 near the rear) as a highest neighbor of 3, so it's "Trapped".
Alright thank you for your answer i get it now. I also thought that it was a space constraint that forced you to not explain more.
I like your project, if you want a French translation don't hesitate to ask and give me an email address to send you the translation.
Thank you :)
That would be really cool! If you want to email me at DavidJLombardo@gmail.com we can talk more about it.