Helm: Radahn's Redmane Helm

Armour: Radahn's Lion Armor

Gauntlet: Radahn's Gauntlets

Leggings: Radahn's Greaves

Where To Find: 

(Click the link above to view the equipment and watch the getting video.)

After overcoming the formidable Starscourge Radahn, head to the Roundtable Hold where Enia will have these items available for purchase.