Shortsword, rare (requires attunement)

Any modifiers to this weapons melee attacks also apply to its spell attacks if it is being used as an arcane focus. As a bonus action you can change the size of this weapon. You can shrink it one size in which it takes the properties of a dagger, or you can grow it one size in which it takes on the properties of a longsword. This weapon retains whatever size it was last assigned to until a bonus action is used to change its size again. This weapon can only change one size larger or smaller per bonus action. This weapon must be submerged in water for at least one minute every 3 days or it will be forced to stay in its dagger form. It can see, hear, and understand common. It has blindsight up to 20ft that is changed to 5ft if not submerged in water for at least one minute every 3 days. It cannot speak and communicates by emitting sounds similar to a violin being played.

Yumi backstory

Yumi was an islander girl who's father was a blacksmith. Her father found a rare metal that could grow and shrink, and was very durable. Once word got out about the discovery a bunch of outsiders wanted it for themselves. The outsiders killed Yumi's father and chased her up the side of a volcano while she had the metal with her trying to not let them take it. They cornered her on the edge of the volcano and she fell in with the metal, but instead of dying she fused with the metal turning into a sword.

Personality

Yumi can be very sassy, but also cares for people and living things. She loves the Ocean, cute animals, and flowers. She is very loud, and is not afraid to show her emotions. She does not enjoy being a sword, and hopes to have a human form again in the future if possible.

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

Notes: Damage, Combat, Finesse, Light, Vex