One of the most fascinating things I've ever done in my life, is the world-building that I'm attempting right now. Attempting to figure how magic would be used to augment technology in a world where magic existed first, attempting to figure out if there is any hatred between Humans and Elves in that world, thinking about different ways that Dwarves could have decided to seek Elven help for making smaller technologies, thinking about the kind of logic they would have used to decide not to pursue guns as weaponry after the initial attempts proved less than helpful--and less useful than a crossbow, considering the different government systems that must exist in that world, considering religious differences between Humans and the Elves that refuse to live inside the Human settlements, and other things that go into making an amazing world.