Decided to add some fluff to this would be city state. Props to @Baron Klatz for coming up with the realmgate ideas.  
This also adds a future grievance between the Lumineth and the Deepkin as the difference between the high born and the failed experiment resulting in the Idoneth. 
 

Matorea 

Located in the realm of Ghyran on the Northern Peninsula west of the The Battle of Pale Gorge and North of the festermere realmgate is the city/port of Matorea that has a Greywater Fastness affiliation.

Long-standing treaties with the Duardin of the Maddening Whorl allows a duardin quarter in the port city of Matorea 

Further out under the cold seas lies a Deepkin realmgate that is linked with Hysh and the idoneth allow the lumineth passage to Matorea and access to a crystal that is mined by the Duardin.

As these trade links are long and required, there has been occasional military support offered to Matorea by the lumineth. 

The Matorean Chamber of Knights Excelsior keep a chamber temple in the city to watch over the Festermere Realmgate to Azyr and the Idoneth realmgate and are ever ready to curb the incursions by the encroaching Orruk Waagh led by Shivertooth and the Gloomspite hoard of Krasbog. Skaven are apppearing in numbers in the deep mines and also combining forces with the local beastmen  which are plaguing the forest areas and raiding into the agricultural district. They are a disorganized lot still in need of a proper leader to galvanize their evil efforts.

These antagonists can be normally contained and thrown back by the  Matorean League but since the Tzeentch Deamon Allmemnal has shown interest in the province, the work of the Stormcast is endless and merciless in its duty.  A fanatical cult called the Disciples of Sigmar are largely used and have the grudging trust of the Knights who don’t sell their loyalty easily amongst the morally weaker humans.