Wondrous Item, very rare
This small, blood red Pellet is usually shot using a blowgun, although it can be swallowed. On a hit the Pellet does no damage but is absorbed through the skin. When using the Awster Pellet in this way, the user gains advantage to hit when targeting a friendly creature.
Can be shot at a target and on a hit, the target rolls a d20 then adds their constitution modifier. If the roll is greater than 16 then they gain 1d6 hit points. If the target also rolls 20 or greater then they permanently gain 1 hit point to their hit point maximum. If the roll is less than 16 then the creature gains 1d4 temporary hit points. If the roll is 16, then the target regains 1d4 hit points and their hit point maximum is temporarily increased by 3.