The Mountaineers are not so much an organization as they are a group of men dedicated to adventure. They go up and down the Dividing Range, acting as guides and bodyguards for the traders who need to pass through them. When they aren’t working, they’re drinking, fighting, and fighting quite well at that. They interact with Dwarves regularly, and many of them claim to have killed Giants. Occasionally, they spread rumors of Dragons.
Mountaineers are almost exclusively male, and have been known to be extremely sexist. Despite this, however, they don’t have much discrimination among their ranks. They openly recruit Rift-tainted humanoids, something that The Cloister does not appreciate.