Chongyun's Elemental Skill infuses nearby claymore and sword users with Cryo, making him a utility sub-DPS for Physical or Cryo carry teams. Pair him with a claymore or sword DPS to amplify Cryo damage or enable Freeze comps; his burst provides additional off-field Cryo application. Noblesse Oblige or Blizzard Strayer are good starting artifact sets depending on whether the team values his burst damage or carries into Cryo reactions.