Godsbane

(POSSIBLE SPOILERS BEYOND THIS POINT)

Description
''An almighty, divine blade received along with your returned heart. Has the power to guide the chosen to true freedom.''

The Godsbane blade is a moniker that describes two weapons in the game: a black longsword and a short, gladius-bladed dagger with a similar hilt, both of which are designed to permanently kill an ascended Arisen.

The longsword is apparently stored within the body of the current Seneschal, and can be summoned once the Seneschal is defeated so the victorious Arisen can release them from their duty.

The dagger is an inventory item found in the tool section of your inventory after defeating the red dragon, Grigori. When selected the Arisen takes the dagger and turns it to his chest. Pressing the plunge option kills you and forces you to return the last checkpoint. The only time one can use it in a meaningful manner is once you take the Seneschal's place at the end of the game.

Location

 * Automatically obtained upon completing the quest The Final Battle and starting Post-Game.
 * May be duplicated at the Black Cat for 99,999 Gold.