A total conversion mod that replaces all factions with original story ones. This is a sci-fi apocalyptic tale of how mankind is close to extinction and pay attention to the advice of a species similar to them who've been watching them for millenniums and are really not ready to see them die.
These are utility units.
They can lay down a disabling mist that disables infantry, vehicles and structures.
They can lay down a corrosive material that is potent to most targets.
And lastly, they have a stealth upgrade that also provides them with a direct means of attack.