The Weapon of Massacre Balisarda is a large, shield-like device in it's inactive state. When activated it splits into many individual pieces, each moving separately, to attack multiple targets at the same time.
First used by Cross Eye Alpha and Beta, then later appropriated by Fear. This weapon has abilities similar to the Beast Chamild Organ, which allows it to distort space to render a certain area invisible from the outside, as well as projecting a shield across that area, preventing entry.
"It's activating... Balisarda's... Absolute closed space for avoiding interruption." Milo, (Ep 0 - Ch 68).
Balisarda also has the ability to dissipate powerful particle beams. Cross Eye Alpha and Beta used them to deflect the combined beams of three AE G-34 Satellite Cannons in (Ep 0 - Ch 29). Perhaps more impressive, Fear used her Balisarda to absorb a Mandala wave attack from Dry called Red Shadow Buster / Mandala 3 Kinds Pray Style Wave Type Focused Particles. This is a new Leonhard sword style that was made by Dry and supported by Pray, completed with the power of Mandala. (Ep 0 - Ch 63)
According to Leo, Balisarda is the most powerful Supernatural Weapon in history. (Ep0 - Ch61)