I've had this idea for a while now, but before the update it was impossible.
The concept is that you play fortress mode, but not with dwarves. Instead, you'd play as fungus people who have to create their own race from scratch. I worked out how the creation would function, and it works pretty well. The fungus people would embark with an intelligent race which is also a pet. This race worships the fungus people and are used as vessels for the creation of new fungus people. The process by which new fungus people are produced includes growing a special plant, and mixing it with a few other things to create a liquid culture. The culture is then fed to one of the fungus worshipers. The culture includes a syndrome which causes a permanent transformation into a fungus person.
There a few problems I can see, and I'd love to have some input on what might be the best way to solve them.
1. If I have a playable civilization with no genders, can I embark with it even though the civilization will be dead? If so, will there be any migrants?
2. According to my testing, the transformed fungus cannot be appointed to noble positions. I don't know if there's a way for the transformation to remove [PET], as I believe that's the issue.
3. Preventing the fungus people from drinking the culture themselves might be difficult. The easiest solution that I can think of is to make the culture a solid edible plant and make fungus people carnivores. I'd like to avoid that if I can, though.
Finally, I'd like some help conceptually. I have no idea what kind of creature would worship fungus people, or what even to call the fungus people. I might go with Myconids, but I think that's ripped off from D&D.