When equipping Artifacts, you can gain additional benefits to your characters by wearing a set. Sets are 2 to 4 of the same Artifact series. For example: Traveling Doctor, Adventurer, or Lucky Dog. To quickly sort your Artifacts by Set, press the (Set Filter / All button) and choose the Set type. Only Artifacts from that set will be displayed. Equipping 4 Artifacts will give you all bonuses.