Vernon, channeling Amadia's power into his blade, commands incredible power as he makes her Shards his own. This weapon has a +3 to attack and damage rolls. When you hit with an attack roll using this sword, the target takes an extra 1d10 radiant damage. Whilst attuned to this weapon, your Charisma becomes 22, and your melee attacks with this weapon are made with your spellcasting ability. 

The sword has 3 charges and regains 1d3 expended charges daily at dawn. When you hit a creature with an attack roll using the sword, you can expend 1 charge to regain a number of hit points equal to the extra radiant damage the sword dealt.

While you’re attuned to this sword, you are immune to Radiant damage. You may use a Pact slot without expending it, once per long rest. Whilst attuned to this weapon, you may select an extra Eldritch Invocation. After a short or long rest, you may change your currently chosen Eldritch Invocation granted by this feature to another.

As an action, whilst attuned to this weapon, you may cast True Polymorph once, cast at 9th level. You can only use this spell on yourself. This spell can only be cast once per long rest. After use, roll a d6. If the result of this roll is a 5-6, you cannot use this feature again, the aspect of the weapon being lost.

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

Notes: Damage: Radiant, Immunity: Radiant, Bonus: Magic, Replace Weapon Ability: Charisma Score, Set: Charisma Score, Versatile, Sap