Wondrous Item, very rare
An arrow of healing is a magic weapon meant to inject a healing potion into the recipient. Some are more focused than others; for example, there are arrows of healing potion, arrows of greater healing potion, and arrows of supreme healing potion. If the creature is successfully hit by the healing potion, they take 1 point of damage from the injection, then are healed for an amount equivelent to the type of healing potion. (2d4+2, 4d4+4, or 10d4+20)
The arrow can then be retrieved, refilled with another potion, and reused.
Other types of magic ammunition of this kind exist, such as bolts of healing meant for a crossbow, though arrows are most common.
Notes: Damage, Combat, Bane