Dragon bolts

Dragon bolts (also known as Dragonstone bolts) are rune bolts tipped with dragonstone. Dragonstone bolts can be created through the Fletching skill by attaching dragonstone bolt tips to rune bolts. Attaching dragonstone bolt tips requires a Fletching level of 71, and for each dragonstone bolt tip attached to a rune bolt, a player is granted 8.2 Fletching experience. Once the dragonstone bolt tips have been attached, the rune bolts becomes dragonstone bolts.

Dragonstone bolts can be enchanted through the spell Enchant Crossbow Bolt (Dragonstone) by a player with level 68 Magic. The spell enchants 10 dragonstone bolts at a time, and once they are enchanted they become enchanted dragonstone bolts and gain a special ability, detailed under Enchanted Dragonstone Bolts.

Enchanted Dragonstone bolts are notable because of their effectiveness against pures with very low defence. The special (and dragonfire in general) damage is calculated based on your defence - if you have none, you will be hit extremely hard (40 to 60+ damage) and consistently.