Blade of Isolation

The Blade of Isolation is a longsword forged by Lord Dakol at the beginning of his existence. It is considered to be the most powerful weapon of Darkness, and forth most powerful weapon ever created.

Dakol briefly used it against Zacharias before being put to sleep. When the time comes, it will be passed onto his vessel, Dairiku Battosai in order to more effectively synchronize their souls together.

Abilities
In addition to being a lightweight and unbreakable weapon, this blade augments the power of any user of Darkness who wields it to enormous heights. However, this power comes at a grave cost: if any beside Dairiku use it, they will die when they let go of the hilt because of the price it requires to fuel it. Because of this, it has also come by another name, the "Sword of Death".

Misc.

 * This weapon could have possibly been used by Damion Battosai when he was in the Depraved Descension during the War of The Path, but it was never shown.