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The Magic Engineer (Recluce series, Book 3) (original 1994; edition 1995)
The Magic Engineer by L. E. Modesitt Jr. (1994)
References to this work on external resources.
Wikipedia in English
This is the story of Dorrin of Recluce, blacksmith and scion of the Order magicians, who invents wonderful devices. His insights violate the rules of Order magic, so he must go into exile in the lands of Chaos--where the forces of the Chaos wizards move across the land and whose ultimate goal is the destruction of Recluce.
(summary from another edition)
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