An extremely powerful samurai sword forged out of the strongest material from a planet called Dismay, and It's main power source are tortured souls. It is black and has red waves. It can cut through diamond like wet paper, and is used by one mean motherfucker named Anthony, a leader of an organization that aims to protect. Only specific people are able to wield it, and it cannot be used to harm humans.
"The Bloodbane is not a toy. It is used only to vanquish evil. Wield it with care, for you may need it one day." - Anthony, giving his sword away before falling to Earth.