2 theories on the origins of the flood
1:they were created as a bioweapon in another galaxy during some terrible war.gravemind was probably made as a way of keeping them under control.after winning the war,their creators couldn't stop them and they ran wild.after they ate everything in their galaxy they set off to find more food
2:they were part of an ecosystem on some world somewhere.but had curbed their instincts to avoid using up all the food.then a curious passer by brought them onto his ship and they infected the crew.after gaining their knowledge they realised that there was an unlimited supply of food out there.naturaly they went nuts infecting everything they could until the food supply was gone.so they set off to find more
if you have a theory please post here
OI! stop reading my things ya limey git!