Muramasa

Weapon Magical, Versatile, Parry, Status, Light. Legendary [Lawful Evil And/Or Dexterity ≥ 15]

An amazingly well crafted katana, this blade is sharp enough that it seems to slice through the very air itself, creating shockwaves when swung at full speed. It is forged from mythril and steel, folded together hundreds of times, leaving a very distinct pattern on the blade, the handle is wrapped in Dragon skin, and the Tsuba and the base of the handle are made of gilded adamantine. When attuned to a character with Dex ≥ 15, every swing of the sword will also create a shockwave, a 15ft cone, everything inside the cone must make a DC 15 Con save, taking 2d6 force damage and being pushed 15 ft back on a fail, and taking half damage with no pushback on a success. When attuned to a Lawful Evil character, any non-planar beings hit directly with the blade of the sword must make a DC 15 Con save, succeeding automatically if they have above half of their Hit Points remaining and the hit was not a critical, taking 25d10 Necrotic damage on a failure.