A ancient blade, once sealed by a Harbingers spell. Now unlocked, it has formed a bond with Aeolus. In it, the Spirit of an ancient Warrior, by the name of Thyella, is stored. She has two distinct abilities. Thyella is chaotic good, speaks Common, Primordial and Infernal.
Between each long rest equal to his Proficiency Bonus, Aeolus can give himself advantage on his next attack. As Thyella is guiding his hand to strike his target.
Her send ability synergizes with their Pact of the Blade. Once attundend to him as a Pact Weapon, she is able to change her form at will. This allows Aeolus to summon her in any form, but not change form on the fly.
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: can only be attuned to Aeolus Niphad, Versatile, Sap