Sorry for making these dagger type, lol. But as far as I could find they didn't have knuckles for a weapon type.

These Dusters are Knuckles that have blades attached to them. They are bloodstained and have the Infernal Inscription "Blood Please." Once Cleansed they become Pure Platinum and the bloodstains are gone.

Insert Name Here is for story purposes. These Dusters have a Demon of your choice residing inside it, preferably one that requires lvl20 heroes to defeat, that spawns after the Monk has reached lvl20 and sufficed the Demon's hunger for blood. Once the Demon spawns you are forced to fight it because it wants to retrieve its property and wreak havoc on the world. Once killed the curse is lifted, also if the Monk has dealt damage to at least 500 different humanoid creatures the Demon leaves the Monk with a blessing that gives him advantage on all attacks. The curse isn't a very friendly one either, if the Dusters are equipped during combat at all, the Monk wearing them takes true damage based on the level scaling system for the item. These Dusters are considered as a unarmed weapon that deals Piercing damage that scale with your level as well.

Lvl1-3 1d4 Piercing, 2 True damage to User(TDU)

Lvl4-6 1d6 Piercing, 3 TDU

Lvl7-9 1d8 Piercing, 4 TDU

Lvl10-13 1d10 Piercing, 5 TDU

Lvl14-17 1d12 Piercing, 7 TDU

Lvl18-20 1d20 Piercing, 10 TDU

Cleansed Dusters 1d20+1d10 Piercing, and if the Humanoid hit count is reached Advantage on all attacks.

Proficiency with a dagger allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Monk using the Item once and then having a long rest., Finesse, Light, Thrown