"Beware, petty mages, for the Daedric Prince Peryite has sent Spellbreaker into Tamriel once more, and Magicka shall shrivel in its wake."
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.