Fume Ultra Greatsword (5e Equipment)

Weapon (greatsword), very rare

This oversized greatsword requires a minimum of 17 Strength to even lift, and you can only ever make one attack with it when you use an action, bonus action, or reaction to attack with it, regardless of the number of attacks you can normally make. You gain a +3 bonus to attack and damage rolls made with this magic weapon, it scores a critical hit on a roll of 19-20, and it has the reach property. In addition, whenever you hit an enemy with it, they must succeed on a DC 15 Strength saving throw or be knocked prone.