The Crystal Vale is a valley in the far northwestern corner of Silithus. It is populated by earth and air elementals and is a popular location for farming too. It is also the location of the final battle in the Thunderfury, Blessed Blade of the Windseeker quest chain, with Thunderaan. One quest in the area is .
The Ravaged Twilight Camp is located in the vale.
In the RPG
Apparently not all the Twilight's Hammer followers are the skilled warlocks they purport to be. In the Twilight Base Camp you can hear a story about this place, where a warlock called Highlord Demitrian got a bit greedy raising crystals. It seems he tried to enslave a powerful air elemental called Thunderaan but got caught himself. Now he and his men serve the wind elemental, searching the area for some talisman.