Cailleath (4e)
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.