A valiant group of adventurers who work for the crown to protect the peoples of the Northlands from threats that the guard cannot, or will not handle.
In the middle of a desert in an oasis is a single prospering oak tree. Near the tree is a large pool of water. Drinking from the water is said to give you eternal life but really only extends your life for as long as you continue drinking from it. Those that have found it and left, have never found it again. Some search for it still.