so far if you're reading along at home about Cobrin'Seil, you'll have seen me invoke the term 'necrostate.' This is a description for a type of stable, present political body, ranging from a whole full-sized country as we'd recognise it today down to a stable persistent city or the like, where political power is in some way concentrated in the control of someone or someones who are dead.
Here's the thing. From the perspective of a long lived leader, the Eresh Protectorate are a fantastic deal for offering stability and long-term growth. They're one of the longest lasting organisations, they have had no major revolutionary actions and their generally hands-off position towards their city states makes them excellent for trade and any special interests. There's an entire Eresh city that feeds the protectorate pretty much nothing but sheep products, and if your special interest is things like ancient magical books or even just medicinal sciences, you probably can do worse than saddle your existing project to this body. Looks good.