Yeerk Empire

The Yeerk Empire formed when a handful of renegade Yeerks that escaped from their homeplanet after they were shown the galaxy by the now-disgraced Prince Seerow. Originally a sub-group of the Yeerks, their access to hosts and advanced technology has allowed them to spread like wildfire throughout the galaxy.

Government & Military
The Yeerk Empire is led by the enigmatic Council of Thirteen. The Emperor numbers among these. The elite guard of the Council of Thirteen is the Blue Bands.

Underneath the Council, there are the Vissers. They number from 1 to 42. The lower the number, the higher the rank. Visser One is, aside from the Council of Thirteen, the most powerful Yeerk in the Empire. Vissers are entitled to their own personal guard, as well as their own Blade ships, and also generally command a Yeerk fleet.

Beneath that are hundreds of Sub-Vissers. The sub-vissers serve as lieutenants and the commanders of smaller ships.

Classification of Species
The Yeerk Empire classifies species according to how (or if) they might be infested.

Class One
These species are physically unfit for infestation. Class Two
 * Arn
 * Hawjabrans
 * Helmacrons
 * Skrit Na

Capable of being infested, but suffer from severe drawbacks. Class Three
 * Gedd
 * Taxxons

Perfectly fit for infestation, but are few in number and cannot be bred quickly. Class Four
 * Hork-Bajir
 * Mak
 * Ongachic
 * Ssstram

Perfectly fit for infestation, but are too great a challenge technologically and/or physically to be infested in great numbers. Class Five
 * Andalites
 * Garatrons
 * Leerans

Perfectly fit for infestation, are large in numbers and able to be bred quickly, and cannot resist the Yeerks. Classification Unknown
 * Humans
 * Perit Hur
 * Anati
 * Garad
 * Mak
 * Nahari
 * Sstram

Small ships
Space ships
 * Bug fighter:
 * Bomber
 * Interceptor
 * Stealth fighter
 * Assault fighter
 * Recon
 * Shuttle:
 * Dropship: