Amulet of Brutal Might

This crackling crystal sphere, crafted by a fire genasi jeweler from the City of Brass, seems to be containing a small shard of essence from the elemental plane of fire. The bearer of this brass amulet becomes a fiercer opponent in battle while wearing it.

While attuned to this amulet, your weapon attacks score a critical hit also on a roll of 19. You can use this feature a number of times equal to your Constitution modifier (a minimum of once), regaining all expended uses when you finish a long rest.