You have a +3 bonus to attack and damage rolls made with this magic weapon.
Soul Fusion. Yatsufusa attempts to absorb the soul of any creature that it kills. When Yatsufusa is used to kill a non-construct creature, you may use your reaction to attempt to absorb that creature's soul. The creature must make a Wisdom saving throw (DC 18). On a failed saving throw, the creature's soul is bound to the weapon and becomes one with the myriad souls trapped within its blade. On a successful saving throw, the creature's soul moves on to its respective afterlife, unaffected by Yatsufusa.
March of the Dead. As an action on your turn, you can release a stored soul, giving it its corporeal form back to fight for you. The creature acts as if it were a normal creature with its own initiative and turn, and lasts a number of rounds equal to 1 + your Wisdom modifier. After its last round, the creature makes a Wisdom saving throw (DC 20). On a failed saving throw, its soul returns to Yatsufusa and can be used later. On a successful save, its soul moves on to its respective afterlife.
Cursed Blade. Once attuned, this weapon cannot be removed from the attuner's person. Whenever you use Yatsufusa to claim a soul, it also claims a portion of your soul, and you lose one hit die. If you must lose a hit die and you have none remaining, Yatsufusa claims your entire soul, and you become one of the many trapped within the sword. If a Remove Curse is used on this weapon, your attunement ends, but the curse persists within the sword.
Proficiency with a Shortsword 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.
Vex. If you hit a creature with this weapon and deal damage to the creature, you have Advantage on your next attack roll against that creature before the end of your next turn.
Notes: Bonus: Magic, Damage: Necrotic, Weapon Property: Finesse, Weapon Property: Versatile, swordsman of corrupt soul., Finesse, Light, Vex