Collect all of the Special Item Collectables and place them in their required pillar to unlock certain special Challenges in the game.
Axe Extender Challenge 4 - Collect all Priest's Amulets
Gauntlet Extender Challenge 4 - Collect all Emperor's Coins
Sword Extender Challenge 4 - Collect all Titan Tablets
Sword, Axe, Gauntlet Challenge 4 (Choose your Ultimate Weapon) - Have All
Special Item Collectables collected
Invictus Gladius-Sword of Vengeance
Beat Sword Challenge 4.
Olympus Cleavers
Olympus Cleavers - Clear Gauntlet Challenge 4.
Olympus Cleavers
Beat Gauntlet Challenge 4.
Ultimate Weapon
After you collect all of the Titan Tablets, Priest's Amulets, and Emperor's Coins and place them each in their required pillars, a gaint stone tablet will appear in the middle of Elysiam (near where the she-wolf statue is). Activate the gaint stone tablet to be taken to a place where you may choose your Ultimate Weapon. Choose one of the three pillars to activate the desired Ultimate Weapon Challenge.