( As an FYI I am giving this to my BBEG for the final battle and making this stat block incase any of my players get their hands on this)
This weapon has a plus 5 To attack and damage rolls made with it.
If you are proficient in this type of weapon then any time you would add your proficiency bonus to a roll made with this weapon you will instead add it twice.
While this weapon is on your person you gain one major beneficial property and one major detrimental property. These properties will remain the same for any subsequent time you may gain access to this weapon. These properties disappear once the weapon leaves your person and you regain them the next time you have this weapon on your person.
This weapon has 3 charges that are regained once a day at dusk
As an action you may expend a charge to cast the spell Gate
As an action you may expend a charge to cut through the universe into what ever lies beyond. (Unfortunately it is up to your Dungeon Master to decide what lies beyond) This will permanently lesson the amount of charges on this weapon by one A charge lost this way can not ever be regained not even by the use of a wish spell.
The exact size and shape of the hole left in the universe is left up to the Dm's discretion but it has a minimum length of 10 feet.
As an action you may expend a charge to undo any damage done by this weapon by closing the hole you opened with the above a action. This will also permanently lesson the amount of charges on this weapon by one A charge lost this way can not ever be regained not even by the use of a wish spell. Assuming there is nothing holding this hole open the opening will close through out the next minute or 10 turns.
Proficiency with a Greatsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Graze. If your attack roll with this weapon misses a creature, you can deal damage to that creature equal to the ability modifier you used to make the attack roll. This damage is the same type dealt by the weapon, and the damage can be increased only by increasing the ability modifier.
Notes: Bonus: Magic, Damage, Combat, Heavy, Two-Handed, Graze