Finally, the long awaited fourth bonus week of double Artifact XP gains when you fortify your Artifacts is here. That means any time you're using Nth Metal to add XP to and rank up your Artifacts, those gains will be doubled. Thinking about jumping into a new Artifact or finally getting that last boost into your current Artifact? Revved up to join the Birds of Prey? Have stacks of Nth Metal just laying around? Time to make the most of it!