Eternal Set (U) is a direct upgrade to its counterpart in the Eternal Set.
Helm/Body/Legs requires 2 Eternal Crystal and 1000 of each diamond.
Gloves and Boots requires 1 Eternal Crystal each and 500 of each diamond.
Aura requires 2 Eternal Crystal and 2000 of each diamond.
Shield and Weapon requires 4 Eternal Crystal.
(Blood Diamond, Shadow Diamond, Smoke Diamond, Ice Diamond) can be obtained through Diamond Chest.