Aubade

The Aubade (オウバードロード) is a form of the Kingdom Key that appears in Kingdom Hearts 358/2 Days. It is one of two unique weapons that Roxas and Xion can wield. The Kingdom Key is changed into the Aubade when the Mystery Gear is equipped.

Design
The Keyblade is composed of a Japanese chokutō with light-flash shaped spikes on the top, middle, and bottom of the blade to make up its teeth and upper and lower guard, respectively.

Trivia

 * The names of Roxas's weapons generally refer to either the pain of parting and loneliness, or light phenomena. The Aubade is the only weapon to do both.
 * This Keyblade, along with the Umbrella, has a much faster swing speed than the others.

Etymology
An "Aubade" is a song or poem evoking dawn which is traditionally a love song of two lovers parting in the morning. While not fully romantic in nature, the most defining aspects of Roxas's personality occur in Twilight Town: after leaving the Organization, he travels to Twilight Town; there, he encounters and is forced to defeat his close friend Xion, destroying her and giving up even his memories of her.