A spinoff game where you start out as a flood spore and kill and devour victims to obtain biomass to morph in a grave mind then lead more flood monsters to spread your society of flood across the galaxy to devour and consume all other life. The game could take place in the timeline of Ancient Humans and Forerunners. This game might be good on mobile devices since it could have game play mechanics similar to plague.inc and additional elements to refine it to feel more like a halo game. Just an Idea I wanted to share 
kind of like Plague Inc.