Twinned Arrows of Dragon Slaying

This pair of arrows have shafts of bone with a groove cut down the middle leading to an iridescent, translucent head of dragon scale. As soon as the blood of a dragon is introduced into the shaft of one, both become an arrow of slaying for that particular type of dragon. If one is used in an attack that damages a dragon, it is consumed becoming a normal arrow, while the other acquires the arrow of slaying traits.  If a creature belonging to the type, race, or group associated with an arrow of slaying takes damage from the arrow, the creature must make a DC 17 Constitution saving throw, taking an extra 6d10 piercing damage on a failed save, or half as much extra damage on a successful one.

Once an arrow of slaying deals its extra damage to a creature, it becomes a normal arrow.

Notes: Damage: Piercing, Damage, Combat, Bane