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Building a Calamity Weapon

A Calamity Weapon does not level like any other. It swaps ordinary smelting for Calamity Smelting, a six-step path that opens Potentials — weapon-specific effects that only fire in the hands of a character proficient with that weapon type. This guide covers unlocking, the Furnace, the Potential tree and the materials to stockpile.

The Calamity Smelting screen: the weapon's Potential tree, your progress and the current cap.
  1. 1Three rules to know going inWhat sets a calamity weapon apart from an ordinary one, before you invest anything in it.
  2. 2Weapon Proficiency and Additional ProficiencyWho wields what, and how to open a third weapon type so Potentials take effect.
  3. 3Getting your first Calamity WeaponThe three steps to unlock your first one, and what each of them asks for.
  4. 4The Calamity FurnaceThe Furnace replaces the forge: how fusion works, and what it opens for free.
  5. 5The Potential treeThe shape of the tree, the first pick offered at each tier, and what the second one costs.
  6. 6Choosing your pathWhich branch to follow, depending on the weapon and the character carrying it.
  7. 7Materials, and where they dropEmblems and crystals: where each material is farmed, and from which mission.
  8. 8Cost of each level, weapon by weaponThe full breakdown, tier by tier and weapon by weapon, as the game states it.