Sheaf of Yuan-Ti Papers

A large bundle of papers written in fluent Juthannan taken from Anoza's quarters after being killed. They require someone fluent or able to use the Comprehend Languages spell in order to translate and transcribe them. Ogron Trevette recognizes that the fist page is likely talking about Rastlin Deepsilver and Gator, but he only has a working knowledge and it will take significant time to translate the papers, and accuracy may be an issue.
After quick translations in the evening Ogron learned that Anoza thought Rastlin's abilities would be helpful in regards to a collapsed temple, which also referenced something about a ritual and some sort of leader. He said the bit about the leader was confusing, and could be either spiritual/political leader, or maybe something divine in nature, but he wasn't positive.
After several days of translating Ogron was able to learn the following information: -The Yuan-Ti they encountered were a scouting/expedition party, searching for something specific by the sounds of it, but he doesn't know what. -There was a stronghold of Deurgar to the southwest of the buried tower, about 1.5 days south through tunnel passages, says there is a nearby exit to the surface that can be used as an escape or to sneak up on the ruined castle if they get support. -There were notes about other ruins explored, which they said were all dead ends. He thinks he can maybe make a rough map based off the descriptions to make navigation of tunnels easier if, but it will take a fair amount of time, and wants to check out the Deurgar stronghold, that maybe if they could find what the Yuan-Ti were looking for he could use it as leverage for Rastlin Deepsilver.