These are the castes as they existed during Ardith's day. Some are added/subtracted depending on the time period. The descriptions should be taken with a grain of salt, as they differ depending on the time period. Note that the castes are plural. To form the singular or possessive, you add an "-i" or a "-ni" (usually, if after a vowel). So many rathked. One rathkedi. And a rathkedi object.