Weapon (greatsword), legendary

"It was much too big to be called a sword. Massive, thick, heavy, and far too rough. Indeed, it was more like a heap of raw iron..."

Originally created to allow the mightiest of human warriors to fight dragons, this legendary blade has since bathed in the blood of so many extra-planar entities that it can cut through their inner essences as well as their physical forms.

You gain a +3 bonus to attack and damage rolls made with this greatsword. If you hit a celestial, fey, or fiend with this sword, it takes an additional 2d6 psychic damage. When you roll a 20 on an attack roll made with this weapon against a celestial, fey, or fiend, it must succeed on a DC 17 Charisma saving throw or die.

Creature with a Strength score less than 19 cannot make an attack rolls with this sword.