Helm: Fire Prelate Helm

Armour: Fire Prelate Armor

Gauntlet: Fire Prelate Gauntlets

Leggings: Fire Prelate Greaves

Where To Find: 

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

Acquired as a drop from Fire Prelate enemies situated in front of the Guardian's Garrison in the Mountaintops of the Giants.