To make the bow-sword, you need to use a Mithril two-handed sword on Doric's whetstone, directly east of Taverley to produce a Slender blade. To finish it off, players need to add a bowstring to the sword. This entire process requires 65 Smithing and 50 Fletching. The bow-sword is later used by the Assassin to kill several Monks of Entrana and snatch the Relic.