Thallain are the Unseelie cousins of the Kithain, servants of the Fomorians created from primal, savage dreams. The major difference between the two depends on edition; in Changeling: The Dreaming Second Edition, while Kithain each have a Seelie and Unseelie Legacy, the Thallain possess two Unseelie Legacies — a Thallain can never possess any Seelie legacy nor can they be part of the Seelie Court. In 20th Edition, Thallain instead have a normal Legacy (usually Unseelie, but not always), and a Nightmare Legacy that implores them to acts of selfishness and cruelty.
The various Thallain kith and their related Kithain kith are as follows:
- Aithu (Eshu)
- Beasties (Pooka)
- Boggarts (Boggans)
- Bogies (Sluagh)
- Goblins (Nockers)
- Murdhuacha (Merfolk)
- Ogres (Trolls)
- Spriggans (Piskies)
The following Thallain kiths were only introduced in C20 and were not present in prior editions: clurichaun, ghille dhu, oba, redcaps, river hags, satyrs, selkies or sidhe.