The Sword of Sovereignty is a mystical artifact from Atlantis. It was the weapon of Aticleas.
The Nazi's had possession of it during World War II until the submarine carrying the sword was sunk. Decades later, it was recovered by Abbey Chase, only to be taken by Hammer Shock Troops.
Natalia Kassle then delivered it to the Hammer Fuhrer who was transformed into Aticleas when the sword was brought together with the Helmet of Second Sight and the Shield of Immunity.
The three pieces of the armor was then washed away by the ocean when Hammer Island was destroyed.