Weapon (longsword), artifact
Xanith's Blade of Light, one of the most powerful weapons of all time. The Blade is an enchanted longsword that glows. Anyone struck with it must face what they really, truly are. Most do not survive.
Proficiency with a Longsword 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.
Sap. If you hit a creature with this weapon, that creature has Disadvantage on its next attack roll before the start of your next turn.
Notes: Damage: Slashing, Versatile, Sap
Don't remember Xanith? *sigh*
https://www.dndbeyond.com/profile/mpruitt085/characters/31270638