The longsword functions as a +2 Magical Weapon.
When using Hex, Hexblades Curse, or Bestow Curse. As a part of the casting, you may choose an additional creature as a target. You cannot use this feature again until you complete a long rest.
Each creature affected by the Curse will increase the threat range by 1.
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: Bonus: Melee Weapon Attacks, Warlock, Versatile, Sap