Fastfairyland

Fast-fairies experience time 1000x faster than everyone else, unless slowed down. They have a debt system and a misfortune system. Misfortune hits everyone entangled with the person who caused it. Debt causes entanglement, as does knowing someone's name (and not just their birth name). Lying and disobeying orders from someone you're in debt to and some other things cause misfortune. A fairy must be slow to gestate a child, which is part of why children owe very large debts to their parents. Humans who go in fairy circles are sped up in the circles and must be entangled with fairies (maybe?) to stay sped up. Fast people can travel along paths in ways that cause them to be temporarily smaller, and need not eat anything besides dew.

Fast-fairies exist parallel to human society, typically Medieval Europe's society, and are at that time most concentrated in Ireland.