Accelerando

Accelerando is a large one or two-handed bladed element launcher used by Hibiki Shichimiya in Endless Utopia Online.

Design
Accelerando is a portable elemental energy cannon with a large blade. It has a second handle in the center of the blade to steady the cannon's aim. While all elemental attacks (excluding purely Earth-based attacks) can be shot out of this weapon, the inside of the cannon barrel was designed so that Sound-based attacks would work the best, much to Hibiki's preference.