Weapon challenges
Collect all of the Titan Tablets, Priest's Amulets, and Emperor's Coins. Deposit all of them in the appropriate pillar to make a giant stone tablet appear in the middle of Elysiam. Activate the tablet to start the weapon challenges.
Annihilation weapon
Win Axe Challenge 4 in the weapon challenges to unlock the Annihilation weapon.
Invictus Gladius weapon
Win Sword Challenge 4 in the weapon challenges to unlock the Invictus Gladius weapon.
Olympus Cleavers
Win Gauntlet Challenge 4 in the weapon challenges to unlock the Olympus Cleavers.