This is my entry for the contest "Life is but a Game!" of my friend
it is based on The Flood of Halo series.
Froot Bug/Grass (Flood·Root)
It is said that it comes from outer space, when they arrive to a planet, they search for a host so they can evolve.
Corfected Bug/Grass (Corps·Infected)
With a new powerful body, they become a dangerous opponent, they lurk in search of new victims to expand its hive.
Gravine Bug/Grass (Gravemind·Vine)
When the sufficient amount of biomass is collected, a Corfected can evolve into Gravine, they are really intelligent beings so they become leaders of its hive, only one Gravine is necessary to end with a entire planetary system.
Well i hope you like it