One of the 13 Artifacts, the Spear of Destiny has the power of foresight and wielding it, one can destory demons and beings of a magical nature.
The Darkness IIEdit
In The Darkness II game the spear appears in the Vendettas campaign. After finding Johnny Powell another mission is given to the assassins, to find the Spear of Destiny. After defeating many Brotherhood members, assassins finaly confront David Graves who impales himself with the spear and becomes the Hell Beast. After defeating him assassins finaly retrieve the spear and end their mission.
In both comics and games series the Spear of Destiny possesses power to kill supernatural beings. During the game it was shown that if normal man would impale himself it will become a demon like creature.