Faerie tales seldom have happily ever afters, no matter what you learned as a child. So what happens to a city caught in a perpetual faerie tale, unable to escape to the mortal world, or to fully become a part of Faerie itself?
Cailleath is the Feyveiled City, a place that shifts constantly between the world and Faerie. Every rock, brick and tree in the city is bursting with magic, but that's as dangerous as it is wondrous. What's it like, to live in a city where casting a spell is as casual as breathing, so long as you don't cast it on the wrong person?
Drop Cailleath into your campaign world if you're a DM, or play a character that hails from there if you're a player. Arcane Cultures: Cailleath is free and systemless.