Oath Keeper

Two Handed ~ Hammer
Available in game for free.
https://telaradb.com/#/appearances/277359934
  • Looted from Expert Mode Kings Breach Dungeon – Level 50
  • Oath Keeper – Bought in the Rift Store > Cosmetics > Costume Weapons, with Credits
For a full list of appearances you can visit the Wardrobe Skins List.