Aristeia

From LSWiki

There's an Aristeia guild in a temple. You can get to it from everywhere. It's pretty great.

Maybe check out the book.

   You say, "I devote myself to Aristes"
   
   You sense a presence settling into your memory, looking to filter and siphon a small portion of your experience for itself.
   
   You are now a second-degree specialist in athleticism, memory, pain tolerance, and showmanship. [event logged]
   
   You are now a fourth-degree specialist in legend lore. [event logged]
   
   You are now a sixth-degree specialist in tenacity. [event logged]

There's a lot we don't know about how Aristes operates, but the basic idea is that you go out and do stuff in the world. This will cause you to earn achievements, which will increase your ratings or (presumably, eventually) have other effects. There are lots and lots of achievements, so experiment!