An arrow of sleep is a magic weapon meant to cause the creature struck to become unconscious. Roll 5d8; the total must be greater than the creature’s current hit points in order for the creature to fall asleep. If affected, the creature immediately becomes unconscious with no saving throw.
The unconscious lasts for one minute or until the sleeper takes damage, or someone uses an action to shake or slap the sleeper awake.
Other types of magic ammunition of this kind exist, such as bolts meant for a crossbow, though arrows are most common.
Proficiency with a Longbow allows you to add your proficiency bonus to the attack roll for any attack you make with it.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Slow. If you hit a creature with this weapon and deal damage to it, you can reduce its Speed by 10 feet until the start of your next turn. If the creature is hit more than once by weapons that have this property, the Speed reduction doesn’t exceed 10 feet.
Notes: Damage: Piercing, Damage, Control, Combat, Ammunition, Heavy, Range, Two-Handed, Slow