This item appears to be a high-tech hilt. While grasping the hilt, you can use a bonus action to cause a blade of plasma to spring into existence, or make the blade disappear. While the blade exists, this magic longsword has the finesse property. If you are proficient with shortswords or longswords, you are proficient with the Youngling Slayer 9000.

You gain a +2 bonus to attack and damage rolls made with this weapon, which deals radiant damage instead of slashing damage. When you hit a sith with it, that target takes an extra 1d8 radiant damage.

The sword's luminous blade emits bright light in a 15-foot radius and dim light for an additional 15 feet. While the blade persists, you can use an action to expand or reduce its radius of bright and dim light by 5 feet each, to a maximum of 30 feet each or a minimum of 10 feet each.

   Youngling Slayer. If you have slayed a youngling (determined by the DM) within 10 days or have an evil alignment, you gain the following benefits while attuned to this item.

• The bonus to attack and damage rolls increases to +3
• All creatures take an extra 2d8 radiant damage, regardless of whether they are sith or not.
• You can cast the following spells without expending a spell slot or material components. The DC for these spells is 19. 
  • At will: augury, hold person, mage hand, suggestion
  • 3/day: dream, hold monster, telekinesis
  • 1/day: dominate monster, foresight

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: Radiant, Replace Damage Type: Radiant, Weapon Property: Finesse, Bonus: Magic, Damage: Radiant, by a force user, Damage, Control, Combat, Foreknowledge, Cursed, divination, Versatile, Sap