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Three rules to know going in
An upgrade path of its own
Calamity Weapons have their own progression and their own effects. Every hit builds Calamity; once the gauge fills, it empties at once to trigger the weapon's signature effect.
One per character
The game is explicit: a character can equip only one Calamity Weapon at a time. Two characters can each carry one, but you never stack two on the same character.
Tied to weapon proficiency
Potentials only take effect if the weapon type matches the character's proficiency. A Calamity polearm in the hands of someone who does not wield polearms is still a weapon, but its tree does nothing.