I.e.
If you hit a creature with this weapon, you can force the creature to make a saving throw with a DC equal to 8+your Proficiency Bonus+the ability modifier you used to make the attack roll. On a failed save, the creature is Grappled by you.
Obviously this will affect monks the most. But then they can drag enemies around with their high speed.
Possibly add in a throw or something for them at some point or as a subclass.
