Twin Blade

"How should I know where the damned blade is? The last I heard of that stupid blade was when that Hellboy-guy used it to slit Satan's throat. Whatever happened next is nothing more than rumors and gossips."

- Matt Wright.

The Twin Blade is an ancient and powerful weapon created by Mammon and a succubus known as Ellie. It has the power to permanently kill almost anything such as demons, monsters, and even beings like Satan and Absalom.

Overview
As stated before, the Twin Blade is capable of killing almost anything even entities as powerful as Satan, evident in when Hellboy used the Twin Blade to slit the throat of a weak and crippled Satan in his throne room while the Devil lay sleeping. It deals massive damage to anyone it wounds and it can pierce through a demon's hide, which is known to be stronger than steel and armor, and can damage the victim's soul. Due to the methods of its creation and coupled with the components it was used for, even non-lethal cuts are excruciatingly painful and eventually leads to death.

Because it was created using the blood of a god and tears of a powerful True Archangel, a wound from it can cause instant death to anyone even nigh-omnipotent beings.

Description
The blade appears as a 3-4 feet long sword and has two blades protruding outward with two curved horn-like crafts on its guard. The Twin Blade was said to be created through the use of these four specific components: the bones of a fallen angel, salt that was crystalized from the tears of Michael, then melted down with the ichor of a god into Damascus Steel.

History
It was first seen being created by Ellie along with the assistance and instructions from Mammon. She used it to stab and kill a powerful archdemon that was one of the first creations of Ayin. Because of the demon's powers, it didn't die but was instead turned into a powerless mortal. John later kept it in a box together with his other magical weapons.

It later appears where the demon Buer tries to get hold of John's soul. While preparing to con the demon by making a copy of himself, he later takes the blade from the box and gives it to someone else secretly. During a severe standoff between Buer and John (actually the demonic copy of him as bait), the other person gave it to the demon copy, and he tried to kill himself with it and succeeds. But is resurrected afterwards. Constantine kept it as a keepsake afterwards.

Image Sources

 * (Twin Blade.jpg) Twin Blade by ???
 * (Twin Blades.png) John Constantine holding the Twin Blade from Hellblazer