The Blade of Souls is a nightmarish creation. The dark god Lazarus forged it from 13 souls, three human souls, three elven souls, three Aventi souls, and the soul of Larseem, the Primordial Aboleth. All the souls but that of Larseem were pure, lost to the realms of life by selfless sacrifice. They were denied their just reward by the horror of the Dreamer, bound to a tool of murder, forced into eternal slavery under Larseem. The Blade of Souls absorbs all light and heat, seeming to be a gash in the fabric of creation. As yet it remains unsullied by the blood of gods, but that shall not last long.
-Book of the Dead