Atlazian Ruins and Trader's Way (Regions of Djorde) - Traveler's Handbook

From the introduction: In the year 1972 YC, the continent of Djorde has entered a gilded age. The recent discovery of arcane magic has ended the age of technology, formerly ruled by the steam engine, firearms, and electricity. As the first generations of arcanists supplant electric lights with spells of continual flame, the world trembles between those who cling to old ways and those who embrace the new.