Ammunition +1, +2, or +3
Weapon (any ammunition), uncommon (+1) rare (+2) or very rare (+3)
You have a bonus to attack and damage rolls made with this piece of magic ammunition. The bonus is determined by the rarity of the ammunition. Once it hits a target, the ammunition is no longer magical.
Dungeon Master´s Guide (SRD)
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DnD 5e Magic Items › Ammunition +1, +2, or +3