The Zeffo Sword of Strength is a Black an big devastated sword that seems to ve from a time that almost no one can remember, when touched by a user of magic (the force) it absorbs the magic within (leaving the user with one less spell slot for every 6 seconds it has the sword on their hands).

What's more interesting about it is the habilitty it seems to have of cancelling every type of magic that touches it, being useful in this way as a shield (using a reaction) or as some kind of greatclub or as a greatsword when the attack its critical 

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

Notes: Damage: Melee Weapon Attacks, The attack count as an action and the use of it as a shield is a reaction , The user is incapable of using any kind of magic , Debuff, Combat, Cursed, Two-Handed, Push