As one of the most powerful and least sane wizards of his time, Creeshus made a number of pacts with nefarious entities in his time as the ruler of Vomorhin. Some were simple transactions of life for power, some wanted artifacts or the delivery of prophesied do-gooders, but others were more... personal in nature. As a result of these consortings, Creeshus was blessed with four children of various monstrous heritages. But life in Creeshus's towers was often as unstable as the rest of the city. If he wasn't meddling in their affairs and trying to shape them in his own image, he was outright ignoring them or imprisoning them in a pocket dungeon dimension.
It was years ago that the four siblings came to their decision. Though their circumstances were vastly different, each knew that the city could not survive with their father as its ruler. However, none of his scions wished to take his place on Vomorhin's throne; the potential for betrayal and infighting was too great. So the decision was made to open the city to a new form of government, but one that could not touch the children of Creeshus. Each would have their own domain over the city, from diplomacy to city defense, where they exercise their influence over Vomorhin without ever officially ruling.
The new government of Vomorhin may be overjoyed at their new functioning economy and rising place in the world, but no one harbors the illusion that they are in control of the city. The whole experiment continues under the watchful eyes of the children of Creeshus and every civic leader knows that it could all be burned to the ground if they ever decide to change their mind.