"Castalian"@en . . "The Castalians are the collective human derived ethnic groups of the people who live on the planet Castalia. There are 2 main groups of Castalians, the air breathers who are the minority, and the water breathers, who are the majority."@en . . "The Castalians are the collective human derived ethnic groups of the people who live on the planet Castalia. There are 2 main groups of Castalians, the air breathers who are the minority, and the water breathers, who are the majority."@en .