Vicious Brass Knuckles

Dungeon Master's Guide (2014) p. 209,

Type
Melee Weapon
Magic
Yes
Rarity
rare
Weight
1
Damage
1d4
Damage Type
bludgeoning
Properties
light

Description

Push (Mastery): If you hit a creature with this weapon, you can push the creature up to 10 feet straight away from yourself if it is Large or smaller.

When you roll a 20 with this magic weapon, the target takes an extra 7 slashing damage.

Light: A light weapon is small and easy to handle, making it ideal for use when fighting with two weapons.

Proficiency: simple, brass knuckles Source: Dungeon Master's Guide (2014) p. 209, Ben Huffman - Pugilist (Third Party)