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As a Demon Weapon, Masamune can assume the form of a weapon. Particularly, a special katana.[2]

Ryōku - (25)

Masamune using Soul Possession on Ryoku while transformed.

Uncanny Sword (妖刀, Yōtō): As a member of the Nakatsukasa Clan, Masamune inherited the weapon transformation of the Uncanny Sword, a powerful katana in its own right which houses various powers. According to Tsubaki, the blade was once beautiful but now is drab due to Masamune's activities.[7] Among it's abilities includes the ability to manipulate Shadows and Soul Possession. According to Franken Stein and Tsubaki, the Uncanny Sword exploits the fear within someone's heart to possess the body and soul of it's victims. After an amount of time, the victim's souls are eaten. [2][2]

Puppet Shadow (傀儡影, Kugutsu Kage): Masamune controls the shadow of the person he has possessed for pincer attacks. The puppet can only say "shadow".

Puppet Thrust (傀儡突き, Kugutsuzuki): By folding the Shadow Puppet around the blade, Masamune can increase the range of a lunge thrust.

Split Branches (枝分かれ, Edawakare): After the Puppet Strike, large spikes come out from the shadow's body to skewer the enemy at close range.

Puppet's Rain (傀儡雨, Kugutsudare): By using multiple Shadow Puppets to restrain his enemy, Masamune stabs his enemy