Hello, i am fairly new to DMing and trying to design a long term campaign arc for the first time. I'm using the Greyhawk setting advanced 30 years from CY 591, and want to have a cabal of aboleths as the big bad. my idea is that the Invoked Devastation called down by the Suel Imperium caused the Far Realm to bleed into Oerth, unleashing the aberrant creatures into the world. Now the Aboleths want to return to their home reality, and control (or perhaps founded) the Scarlet brotherhood as a means of gathering all the bits of the original device that cause the planar bleed so that they can suck Oerth into the Far Realm. My problem is that i don't really know how I should characterize them, or what their home base should be like. Any thoughts on how Aboleths would act and live in their role as the puppeteers of the Empire of the Scarlet Sign?