Collect the Titan Tablets, Priest Amulets, and Emperor coins. Now offer them at the correct pillar to unlock the Weapon Challenge arena in Elysiam. Earn different weapons by completing challenges as follows in Elysiam:

Annihilation - Clear Axe Challenge 4
Invictus Gladius - Clear Sword Challenge 4
Olympus Cleavers - Clear Gauntlet Challenge 4