On Miloh's last "business delivery" trip to the fort, he also stopped to talk with people at the fort about the Lunar documents he took from the fort.
[Note: Miloh hasn't clarified why he needs to come through the fort now that the Lunars are gone, but it's part of the arrangement he's made with Elohwyn that he can come and go as he pleases. Those of you who know him fairly well are sure that he's a smuggler of sorts, but what else he is up to is clearly not your business, and Elohwyn tells folks to leave him alone.]
Miloh explains the highlights of the Lunar documents to folks gathered around in the fort; Elohwyn sends a few vingans and other NPCs away while he goes over the details, but she seems unconcerned that everyone else (PCs except unconscious Blu) hears it. It seems that the sorceror Hazphar Pharates knew about the Dreamlink and the Field Survey Team was able to chat with Firshala, pacify her a bit and get access to the tomb room, and then break into First Dreamer's sarcophagus and remove the Dreamlink. He then tried negotiating with First Dreamer to help with access to the Battle Wyrm Striking-Teeth-And-Consuming-Rage, and to an extent had some success, but your attack interrupted this process and it is likely that Hazphar intentionally or unintentionally freed the wyrm hoping for help (but got charred instead!). The Lunar documents also include notes on the secret cavern down the waterfall past the big back door of the fort, where the Battle Wyrm is kept in stasis, and notes about how the team explored further downriver and ran into a most unfriendly naiad (water nymph) and had to turn back. There are also some translated Irripi Ontor documents about the fort that include many things Tison already has told you about or Idylla has learned (e.g. how Firshala's power was harnessed by the Godlearners first, then moved here by the Empire of the Wyrms Friends to provide power for the fort, and First Dreamer's role as a controller for this power, then his betrayal of the priests here and his imprisonment, yada yada). The key new insight that the notes provide is that there is a second tomb underneath the fort where the original priests were entombed at the end of the Empire's reign. Obviously the Lunars investigated the tunnels under the fort, and their records say that they suspected that the narrow acid-trapped tunnel was the entrance to this tomb.
Also, from other documents in the fort, more cryptically encoded, Miloh's people have been able to glean this much info so far: 1. They got the tax official that Miloh was after to give up the secrets to finding the hiding place of much of the Lunar taxes, which Ettir has since used to fund hiring Sun Dome Templars and other things. That was a part of the New Teeth's interest in the fort, they admit; they suspected this guy knew something about the Lunar hoard.
2. The fort was infiltrated before and after you left by Lunar agents acting against Sor-Eel (and you, sort of), by order of Gim Gim the Grim. Gim Gim had his own ring of Black Fang assassins, Miloh says, who have all been sought out and killed, but more sinister is his strong affiliation with the Krarsht cult. The documents show that Gim Gim was trying to get Krarshti tunnels dug into the fort, but the plans were not finished before you retook the fort. Miloh says that now the Krarsht cult is all but powerless and will take decades to recover, thanks to you (The Black, etc.) and other actions by the New Teeth and their allies. Likewise, the Black Fangs have vanished or are dead, and thief rings under the thumbs of the Lunars have fled or been disbanded or killed.
3. The two spies that most concern you are the one calling himself Falco Tubrother, whom Miloh suspects is a Krarshti Lunar agent (he was disguised as a minor tax official/scribe and planted in the fort as a mole), and the other who called himself Chendry Lomorri. Both were certainly Illuminated and using assumed names and identities. The documents have hints that Chendry was somehow involved with the Crimson Bat cult. Both were "loose cannons" under Gim Gim seeking to further his own agendas, which seemed to run against some of Sor-Eel's more conventional ones, judging from the tone of the messages. Gim Gim seemed much more abhorrent, using chaos in much more malicious ways. Why they did certain odd things, like run off with money you gave them to place weapon orders, or help you in several cases that harmed the Krarshti, Lunars, or Crimson Bat cult, still is as much a mystery to Miloh as it is to you, he confesses. He says that his people are avidly seeking these two and many other Lunar spies escaped. Likely locations include Adari, troll lands, the wastes, or Corflu, unless they made it as far as Sartar. Miloh explains that the Lunars had an enormous number of spies committed to this area, far more than usual for such a small place, and it's no surprise that they targetted you and the fort, among many other places around here. Many of the actions of these spies have been contradictory, crazy, or just plain stupid. The Lunars seemed to think that flooding the city with spies would solve their insurrection problems, but Miloh has seen firsthand how many of these spies became drunk on power and/or totally insane, even tainted with chaos. Miloh is glad that their time has ended in Pavis, more or less. You get the feeling he's had a lot of bad experiences with these sorts of characters.