Iskoort

The Iskoort are a joined symbiotic species consisting of the Isk and the Yoort.

Biology
The outer body of the Iskoort belongs to the Isk, which have a torso like a pink accordion. Their heads resemble vultures, and their legs are bowed. The Yoort, which resides in the brain of the Isk, possibly resembles a slug, like the Yeerks, and may be related as they also feed on Kandrona Rays.

The Iskoort would be considered the next step in evolution for a parasitic species. The Isk were artificially created, and engineered so that they could not live without the Yoort. The Yoort were likewise modified so that they can't live without the Isk, ensuring that neither of them rebels or abuses the other.

Culture and society
The Iskoort are a strange, capitalistic race that deals in a variety of goods and services. To manage all these aspects of trade, they are divided into castes which are organized into guilds, each created to monitor and handle a specific service.
 * Guild of Traders
 * Criminal Guild
 * Warmaker Guild
 * Servant Guild
 * Shopper Guild
 * Worker Guild
 * News, Gossip, and Speculation Guild
 * Superstition and Magic Guild

History
According to their history, a race called the Yoort rapidly expanded to enslave other species and convert them into hosts. However the Yoort began to realize their expansion and enslavement of other races was not profitable in the long run. To free themselves from the cycle of war, they engineered special hosts called the Isk that would be most suited to them. In order to become true symbiotes, they altered themselves as well, to make this symbiosis real, so that they and their host bodies formed a new single race, the Iskoort.

The Iskoort would then build an orderly society on their new home planet based on trade, not conquest. The Ellimist and Crayak wage a battle over them because in about three centuries, the Iskort and the Yeerk will meet, and the Yeerks will discover that there is an alternative to their current lifestyle.