The Blade of Olympus is used in Divine Fury, Kratos' Level 1 Super Move. Kratos uses the Blade of Olympus to run forward while performing a cutting slash.
The Blade of Olympus is used during Divine Reckoning, Kratos' Level 2 Super Move. Kratos stabs the Blade of Olympus in to the ground creating a tornado that kills anyone standing above him.
The Blade of Olympus is featured in Rage of the Gods, Kratos' Level 3 Super Move in which he wears the Armor of Ares and wields the blade. In this form the blade can fire a fireball to attack foes out of cutting range.