Any thaumaturge specializing in the summoning and control of elementals can be called an elementalist; it is unclear whether "elementarii" is a synonym or refers specifically to those elementalists in the New Crobuzon militia.

Elementarii use their thaumaturgical power and sometimes devices to call forth the violent personalities of the elementals from the substances around them. Control over these creatures is uncertain and dangerous, and elementarii must make expert use of their magical gnoscourges to direct their conjured weapons.

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