Elahil spilled the Crossing Oil you gave him from another favor and now '''needs [[Uncrossing Oil]] ''' to cure his blisters on his fingers. Visit the Uncrossing Oil page to see how to obtain it. Like any other items, if you are lucky, you '''can buy it from specific shops ''' under the Buy Used tab if other players have sold it there. Give the oil to Elahil to complete the quest, congratulations!