Hoard of the Dragon Queen
An unusual Dwarven Thrower, Gabbro has the thrown property with a normal range of 20 feet and a long range of 60 feet. When you hit with a ranged attack using this weapon, it deals an extra 1 d8 damage, or if the target is a giant, 2d8 damage. Immediately after the attack, the weapon flies back to your hand.
When thrown, Gabbro emits a loud thobbing hum as it spins towards its target. Until the beginning of the throwers next turn, all uses of Bardic inspiration use a die one larger than normal (1d6 becomes 1d8, d8 becomes d10 etc).