Dragonbane bolts (unf) are made by smithing Dragonbane bars on a Kethsian anvil, requiring level 82 Smithing and completion of Ritual of the Mahjarrat, producing 50 unfeathered bolts and giving 62.5 experience per bar. Feathers can then be attached to the unfeathered bolts to create Dragonbane bolts, requiring level 80 Fletching and giving 70 experience per set of 10 bolts feathered. The Assist Systemcan be used to make these bolts.
Trivia
Even though the in-game skill guide states that 80 Smithing is required to make these bolts, the required level is actually 82.