Welcome to the RXP Gold Assistant’s Guide to selling Khorium Scopes. 

The enemies that drop this pattern are located around Manaforge Duro in Netherstorm. It is dropped by Sunfury Bowman, not the Sunfury Archers and it is a rare drop so be prepared to make some time to get this pattern. Lastly, this item is bound on pickup so don’t expect it to be in the auction house and only Engineers can get this item to drop.