Bonus Artifact XP Weekend! Get your Nth Metal ready, because this weekend Artifact XP gains are doubled when you fortify your Artifacts. That's right, any time you're using Nth Metal or Sin Stones to add XP and rank up your Artifacts, those gains will be doubled. Thinking about jumping into that new Artifact? Have a bunch of Nth Metal ready to go? Now's the time. For more information about Artifacts and how to rank them up, refresh your memory with the Artifact guide. The bonus weekend will begin this Thursday (May 10, 2018) with daily server restarts, and last through Sunday (May 13, 2018), to daily server restarts on Monday morning.