Just so we are clear on where this blog stands:
The Amyr >>>>>>>>>>>>>>>>>>>>>The Lethani

seen from United States
seen from United States
seen from United States

seen from T1
seen from Türkiye
seen from United States

seen from Russia
seen from United States
seen from United Kingdom
seen from China

seen from United Kingdom
seen from United States
seen from Türkiye
seen from United States

seen from Malaysia

seen from United States
seen from United States

seen from United Kingdom
seen from United States
seen from Sweden
Just so we are clear on where this blog stands:
The Amyr >>>>>>>>>>>>>>>>>>>>>The Lethani
Who keeps you safe from the Amyr? The singers? The Sithe?
The Kingkiller Chronicle—Where are the Amyr?
The Cthaeh says to Kvothe:
"Not many folk will take your search for the Amyr seriously, you realize," the Cthaeh continued calmly. "The Maer, however, is quite the extraordinary man. He's already come close to them, though he doesn't realize it. Stick by the Maer and he will lead you to their door."
Then Jokes:
"Blood, bracken, and bone, I wish you creatures had the wit to appreciate me. Whatever else you might forget, remember what I just said. Eventually you'll get the joke. I guarantee. You'll laugh when the time comes."
I don't think this is actually correct, but it's an idea. What if the Valaritas door in the archives is the door, or one of the doors of the Amyr? It could be like the door to the fae where it's one of many gateways that lead to an entirely different realm, or it could be a door to one of many strongholds, meeting places, or other types of places significant to the Amyr.
Valaritas has no direct translation in Latin, but it makes me think of Veritas, which is truth. It's possible that this door could contain truths (especially about the Amyr or the Chandrian), or books that contain the truths of the world. I think that this would be a little obvious for Patrick Rothfuss since he's clearly a bit of a creative genius.
If Latin is the root of the word (which I doubt it actually is), here are some other slanted possibilities:
In Latin:
Valeritas means roomy
Vale means farewell
While in Spanish:
Valer is the verb to have value or to be worth, which also to some degree means to cost, though not in monetary terms
In English:
Valor means "great courage in the face of danger, especially in battle" (The New Oxford American Dictionary)
I'm not entirely sure what the implications of these are, but the farewell translation is a rather foreboding prospect.
I have also read some theories that advocate that Master Lorren is one of the Amyr, especially given that there is a stringent an austere lack of information on the Amyr in the archives. I am skeptical about this, but perhaps not all of the affiliates of the Amyr are hands of the law—perhaps they too have archivists and other less righteously aggressive positions. I feel that somehow this would account for Lorren's emotional distance, imperturbable calm, and seeming lack of humanity. But if this theory is correct and the Master Archivist is one of the Amyr, it would make sense for the door in the archives to have something to do with the Amyr.
The problem is with the other Masters. They would have to know the true nature of the door, or be at peace with a lie about it. I doubt nosy and overbearing Master Hemme would be okay with Lorren telling him that he need not know what lies behind the door. Unless the Masters are all affiliated with the Amyr, and I find that extremely hard to believe. Plus, we are lead to believe that Puppet knows about the door since he tells Kvothe "I don't think the four-plate door should be of any concern to a student."
I know these are all extremely farfetched theories, so feed me your ideas!