Ice Sword: Yukianesa (氷剣・ユキアネサ Hyōken: Yukianesa, localized as Mucro Algesco: Yukianesa) is an Arch-Enemy Event Weapon in the shape of a Japanese sword. This weapon is wielded by Jin Kisaragi and previously by Seven.
Yukianesa's blade is formed from a special ice that never melts. It has an ability to absorb the Magic Element and crystallize the water in the air to use as weapons, or freeze its targets directly. The ice created by this Event Weapon is so powerful that it erodes all life.
The weapon itself has a will of its own, and Jin has been manipulated by the sword to drive him into murderous rages. Since he learned to control the Power of Order, Yukianesa has no power over him.
- Yukianesa ("snow sis") is a Japanese fairy (more famously known as Yuki-onna).