Yamiryuu

Yamiryuu (ヤミー竜, Yamiryū) is a legendary blade possed by Pura Rihawk and is the 'sister blade' of Shiroryuu.

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?