There’s a lot of freedom in writing fantasy, which is one of the reasons it’s my favorite genre. In addition to the sheer magnitude and epic fun of massive battles, cool swordplay, kingdom politics and dragons and danger, there’s also the enjoyment that comes with worldbuilding. You can have everything from mysterious powers to elemental control to magic-replacing-technology in a way that weaves the modern and medieval together.

But where worldbuilding in fantasy gets tricky – particularly hi...