| Text | An arrows (20) of slaying is a magic weapon meant to slay a particular kind of creature. Some are more focused than others; for example, there are both arrows (20)s of dragon slaying and arrows (20)s of blue dragon slaying. If a creature belonging to the type, race, or group associated with an arrows (20) of slaying takes damage from the arrows (20), 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 arrows (20) of slaying deals its extra damage to a creature, it becomes a nonmagical arrows (20).
Ammunition: You can use a weapon that has the ammunition property to make a ranged attack only if you have ammunition to fire from the weapon. Each time you attack with the weapon, you expend one piece of ammunition. Drawing the ammunition from a quiver, case, or other container is part of the attack (you need a free hand to load a one-handed weapon). At the end of the battle, you can recover half your expended ammunition by taking a minute to search the battlefield.
Source: Dungeon Master's Guide p. 152 |