Espada de la Oscuridad

The Espada de la Oscuridad  (闇の剣, Yami no ken) is the signature weapons of Kagetomo Keikatsu', Navigator of The White Night Pirates and a member of The Winds of the Eternal Flame. The weapon consists of a Sword with a hilt similar to a rifle and the sheath for the blade is made to function as a gun.

Appearance
Come on! Tell us what it looks like! Does it look Sinister? Cool Pirate design? Shiny? It's too bright!!! Any decoration? Is it on fire? HOT!

Abilities and Powers
So is it your typical weapon?

Higher grade? Magical powers? Turns into a creature that strike all those who dare to mock it?

History
So........how, what or who made it? How did it come in into your character's possession? Used for good or evil?