Drakopede Mandible
Drakopede Mandible
Weapon (greatsword), legendary (requires attunement)
A massive blade fashioned from an entire drakopede mandible, this unusual blade is twice as heavy as an ordinary greatsword and twice as sharp. A creature reduced to 0 hit points by the blade is cut in half. Additionally, when you take the Attack action and only make attacks with the blade, you can make a single attack with the weapon in addition to the number of attacks you would normally make.
Ref: TPKB1 p256