Ash Cat {Haineko}

You have a +1 bonus to attack and damage rolls made with this magic weapon.

Cat Round Dance. You can cast the spell Fog Cloud, as a 3rd level spell. You can do this once per combat encounter (or short rest). 

Slashing Storm. You can use a bonus action to speak this magic sword's command phrase  - "Growl, Haineko", allowing you to cast Steel Wind Strike as an Action (as a 5th level spell). You are able to do this a number of times equal to your proficiency bonus per long rest.
     - Steel Wind Strike: You flourish the weapon used in the casting and then vanish to strike like the wind. Choose up to five creatures you can see within range. Make a melee spell attack against each target. On a hit, a target takes 5d10 force damage. You can then teleport to an unoccupied space you can see within 15 feet of one of the targets you hit or missed.

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Haineko (灰猫, Ash Cat): The Zanpakutō's form is that of a straight-bladed katana. The tsuba is in the shape of a cat's head, with two triangles on the top half curving into ear-points, and the bottom half tapering down into a single point. It has a dark red handle. Originally belonging to Rangiku Matsumoto, it was given as a gift to Cameron the Clairvoyant, a magnificent magi of wonder and whimsy. 

Shikai Special Ability: In its Shikai, Haineko's blade turns to ash, and with a flick of the hilt, Rangiku can cut anywhere the ash has landed on. All the ash that surrounds her opponent(s) might as well be her sword. With simple hand gestures and a thought she can control where the ash goes as well as make it take various forms. Though in this form it takes on the look of scattered ash, each particle is a tiny blade. Rangiku controls the ash to attack from any direction as soon as she moves the hilt, ultimately enveloping and tearing up the enemy. The main attack strength of Haineko comes from how much ash makes contact, thus why it is clumped together. The ash can cut through objects as easily as a sword would.

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, Combat, Versatile, Sap