"The powerful shield called Pandemonium is said to have been forged in a chaotic elemental plane where fire, ice and lightning continually clash."
Artifacts cannot be crafted or tempered. They can only be found in the Abyss or Chests.
Perks like Elemental Protection modify the damage values you see in game. The values listed on this page are the base values before any modifications.
Artifacts cannot be tempered.