A purified Acheron Blade inlaid in gold with the heads of the Seven Gold Wyrms of Bahamut, with the head of Troannaxia The Claw inlaid at the hilt. 

 

Dark Blessing. While holding the sword, you can use an action to give yourself 1d4 + 4 temporary hit points. This property can't be used again until the next dusk.

Disheartening Strike. When you hit a creature with an attack using this weapon, you can fill the target with unsettling dread: the target has disadvantage on the next saving throw it makes before the end of your next turn. The creature ignores this effect if it's immune to the frightened condition. Once you use this property, you can't do so again until the next dusk.

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

Notes: Paladin , Versatile, Sap