(Going from highest to lowest)
Royals - This caste includes the Queen, her mate and offspring, the queen is in control of everything that goes on in the tribe. The royals are also known for their electric breath and incredible senses

Nobles - These dragons are mainly Royal Advisers, Generals and Task Masters. They're known for having longer and sharper claws then any other caste besides the Warriors and Guards

Warriors/Guards: The protectors of the upper Castes and also the dragons who are in charge of keeping the Undesirables in check.

Scouts: Known for their incredible speed and stealth not to mention their incredibly small compared to other dragons in the tribe

Workers: Simple dragons who just do basic things for the tribe to make a living, Getting food, building etc.

Undesirables: The largest caste that is the lowest, these dragons are forced to do tasks and are essentially slaves in Ridgewing society.