Cult of the Dark Father
Worship of Annihlous is common in the deeper mists where his power is strong, but sometimes people who dwell up in the light of Solus also turn to the Dark Father. In most cases such a person is alone and isolated, keeping their devotion a secret and doing little to draw attention to themselves.
But sometimes those dedicated to Oblivion find each other, or actively recruit other followers, and end up creating a cult. Any time a cult dedicated to Annihlous comes together it is inevitable that they will begin to undertake plans that involve theft, kidnapping, ritual sacrifice/murder and the creation of undead. Few such cults can remain hidden for long, but the damage they can do is remarkable if they know what they are doing. Their ultimate goal is to cause the aerolith they are on to fall, even if it is only by a few inches – every little bit brings them all closer to Oblivion.
There are rumors of a true Cult of the Dark Father, that consists mostly of nobility and rich merchants, who trade their continued power and wealth for their decisions in matters of great importance – such as going to war. These stories are probably just wild accusations made by those who do not know or understand the underlying reasons for such decisions, but the rumors persist nonetheless.