A question asked on the Halo Story page got me wondering, and I think I've found the connection between StarHammer and Halo. For those of you who have not read StarHammer, here is what it is about. Humans have been enslaved by an alien race and are allowed to carry on their lives, but in a very limited fashion. The Human resistance is seeking a weapon called the StarHammer to overthrow their alien overlords. Okay, onto the connection. The StarHammmer is a weapon of unimaginable power. It blows up stars, there by destroying planets, and it only needs a cubed kilometer of material to do it. And here follows the connection:
Every race reaches a level where the only way to go is out, to expand, to find other planets and galaxies in which to gather resources to supply the endless appetite of it's peoples. Imagine this; Forerunner ships reach the Milky Way. They have traveled hundreds of light years, and find a few blooming races that pose no threat as of yet, but do resist the initial attacks. So, they design a few devices to keep these races at bay until reinforcements arrive. These devices? Fortress worlds. Worlds that have the power to completely eradicate the galaxy of all sentient life. Or, if destroyed, release the flood. Either way, everything in this galaxy is in trouble. This is the common link that Starhammer and Halo have. Both have a weapon of enormous power that contains an adaptive super-parasite. In Halo, these weapons were structures hidden in out of the way solar systems. In Starhammer, these weapons were gigantic crawling machines hidden in the bottom of oceans in out of the way solar systems. Also, both weapons had an AI guardian bound by strict rules (343 Guilty Spark and the Keeper) who were tasked with keeping the virus contained within the structure.
This brings me to my new theory on Halo and the flood. The flood was deliberately placed on the Halo, not for resarch or anything like that. The flood was the safety device on the Halo. You can't blow up Halo, because it will release the flood which will kill you. So there is the perfect weapon. It can sit there forever, waiting to be used. You can't disable it or you have basically accomplished what the Halo would have done, only in a more painful method.