The Uncanny Sword (妖刀, Yōtō) is a demon weapon form transformation passed down by members of the the Nakatsukasa Clan.[2] Masamune Nakatsukasa had inherited this transformation from his ancestors. After his death, the Uncanny Sword is then absorbed by his younger sister.[2]

After gaining the transformation, Tsubaki is capable of changing to this form via Tsubaki Mode Change: Uncanny Sword (椿のモード変化「妖刀」, Tsubaki no Mōdo Henkō "Yōtō").[2]


The Uncanny Sword takes the form of a katana with a black blade and a bandage-wrapped hilt.[2] In the anime, the Uncanny Sword's true form is expressed. The sword takes the form of a completely red, bright glowing version of the original Uncanny Sword with a longer blade [4]

Special Abilities

Soul Possession (魂憑依, Tamashī Hyōi): One of the Uncanny Sword's known abilities is "Soul Possession", in which exploits the fears in people's hearts to possess the body and soul of the person who carries it. In the end, it absorbs the person's soul entirely.[3] The appearance of the individual changes; they gain black lines around their face. Those possessed also take on red eyes.[5]

Shadow Manipulation:The Uncanny Sword also can control the shadows of its host.[3]

True Form: In the anime, it's true form, the Uncanny Sword gives the meister a tremendous boost of power. This form is only attained after acceptance of the Will of Nakatsukasa, in which allows the full power and usage of the transformation (and therefore it's related techniques) without ill effect.


The Uncanny Sword cannot control two soul wavelengths at one time during soul possession and as such, control can be disrupted with a wavelength control technique (i.e Ultimate Move: Black☆Star Big Wave.[3]

List of Techniques


  1. Soul Eater: Official Fanbook Crisis Edition
  2. 2.0 2.1 2.2 2.3 2.4 2.5 Soul Eater Manga: Chapter 8
  3. 3.0 3.1 3.2 3.3 3.4 Soul Eater Manga: Chapter 7
  4. Soul Eater Anime :Episode 46
  5. Soul Eater Anime: Episode 10
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