[@thewizardguy]

There is indeed, I thought I had made that clear. The limit would be around CASTs, which are essentially robots. They are a step below sapient, but several steps above sentient. So, it's limit is... I'm trying to think of an example?

Ok, just going with one I know off the top of my head. The androids from my Rivard verse in rising, the SEED wouldn't be able to easily infect them.

*edit*

Oh, I just noticed that limit and complexity were seperatelling

No, technically there is no limit to how much they can infect. However, SEED outbreaks tend to happen within a limited area, and are easily contained. A small amount of people can easily keep a SEED infection from spreading. That being said, if it has remained long enough to actually infect the area, then the area needs firebombed before it becomes a "Hive" when a SEED hive is formed, it can create pure SEED forms, without need for infecting lifeforms. However that process takes several months, and it's easy to detect SEED outbreaks.  


Do note that area refers to that terrain. The SEED infection can physically change the terrain of an area, like if you were to dump toxic waste into a forest, the forest would die in a few months/years.