Blade of The Traitor King

Wondrous Item Magical, Heavy, Two-Handed, Cursed Legendary (this item requires attunement) [Enchantment]

The Blade of The Traitor King is a +5 greatsword. The greatsword has the following additional properties:

A Lawful Evil character can attune to the sword in 1 minute, as can an Oath of Conquest Paladin.

When attacking any Humanoid, the sword deals a bonus 2d6 Necrotic damage.

As an action, you can invoke the soul of the Traitor King and force each creature of your choice that you can see within 30 feet of you to make a Wisdom saving throw (Save DC 17). On a failed save, a creature becomes frightened of you for 1 minute. The frightened creature can repeat this saving throw at the end of each of its turns, ending the effect on itself on a success.

Cursed. This weapon is cursed, and becoming attuned to it extends the curse to you. Until the curse is broken with a remove curse spell or similar magic, you are unwilling to part with the weapon, keeping it within reach at all times. In addition, you have disadvantage on attack rolls made with weapons other than this one. When you attempt to get rid of the weapon by throwing it away or giving it to another person, the blade will cast Bestow Curse on you at 5th level (spell save DC 17) with the effect of: "While the target is cursed, attacks with this weapon deal an extra 1d8 necrotic damage to the target."