The Stewardship of Rythe

No one knows much about the Stewardship of Rythe. They are isolationist, hate empyrrics and don't allow many visitors to the one planet (Rythe) that they control.
Rythe is a large world, operating at 2SC-14 (48-hour days, 14 hours ahead of standard chronology). It stays barely above freezing most of the year, with a thin band of green nestled between its expansive ice caps.
Despite their love of castles and their tendency to use creatures for transportation, their technology is surprisingly advanced...