Midnight

Cinder's Weapon is a Dust-created and glass-based weapon with multiple forms created by Cinder Fall. Cinder is first seen wielding it in "Dance Dance Infiltration".

Cinder previously used a metal version of the same weapon in the past, as seen in the flashback episode "Beginning of the End". The glass weapons appear to be modelled after the metal version.

Description
The weapon consists of a pair of blades which combine to form a bow. It is stated to be made of glass, and it seems to be created using bright orange Dust. It has a dark, charcoal-like color. The weapon has a resemblance to obsidian, which is black volcanic glass.

In Sword mode, the weapon is a single-handed weapon similar to a European seax or a Moorish scimitar. The blade is broad and has multiple cutting edges, although the blades must be relatively light to enable the user to keep them balanced when using them in their designed dual-wielding form.

In Bow mode, the weapon uses a straight bow design with a hand-grip built into the frame and is capable of producing multiple broadhead-tipped arrows that detonate on impact.

The arrows are able to reform themselves if something should shatter them before they hit their target.

After gaining the full Fall Maiden's powers, Cinder sets the blades on fire.

Metal Version
In "Beginning of the End", it is shown that Cinder's current Dust-based weapon is based on an older weapon that was constructed out of more traditional materials. Cinder used it in her battle to defeat Amber and also during a raid on a White Fang encampment.

While not using it, she carried her weapon on her back along with a sheaf of arrows.

Trivia

 * The weapon is unlike any other bow in the sense that it does not appear to have any visible bow string. The metal version of this weapon has a bowstring, however.