You have a +3 bonus to attack and damage rolls made with this magic weapon. While attuned to this weapon, you are immune to being charmed, frightened, and possessed. Attacks made with this weapon deal an additional 2d10 force damage, which ignores resistance and immunity to force damage. It instead deals an additional 4d10 force damage to fiends. Additionally, if you roll a 19 or 20 on an attack roll with this weapon against a fiend, if that fiend has 100 hit points or less before calculating damage, it dies instantly.

Whenever you kill a fiend with this weapon, you may choose to embed the blade into it and break the hilt off of the weapon. The fiend dies permanently, and is unable to return to life by any means. After using this ability, this weapon is destroyed.

Proficiency with a longsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Bonus: Magic, Damage: Force, Damage, Combat, Versatile