This is an infestation of the Downworlders' Berzerker-B Nanocells gone to a whole new scale. They have infested numerous amounts of universes and are stopping at nothing to consume everything and destroy what they can't consume. They are one of the worst kinds of infestation you can run into, as their shots contain the Berzerker-B/3 Nanovirus. This means that if their bullets hit you and you don't have nanobots or the nanotechnology to destroy the Berzerker-B/3, you will almost certainly become one of them.
As well, it seems they have also evolved into a B/4 strain, though the numbers of this new, more advanced strain are still few.
EDIT:
The Khanid Infestation is no longer in use, and is archived.
Berzerker-B/3 Android Soldier
Such androids have, surprisingly, a fair amount of intelligence. Although they can't speak, they have an extremely complex communications system that is extremely difficult to decode and rather easy to change in a couple of seconds. They can also use that same comms system to hack into the enemies' headset and communicate with them that way, and can understand you quite well.
Berzerker-B/3 Steamroller Tank
Integrated with a quite intelligent AI, these tanks can lead a squadron of androids even in the heat of battle. They possess impressive firepower, including a main 105mm Cannon, Two gatling guns, Anti-missile flares and chaff, and light mortar shells.
Berzerker-B/3A3 Lawnmower Gunship
Integrated for greater compatibility with older helicopter technology, the rotor is surprisingly silent and can take this gunship at very high speeds. All weapons on this gunship is for utterly destroying the enemy's ground forces.
Berzerker B/4A2 Doombringer Gunship
A nightmare for any ground forces, this is an extremely heavily armored anti-gravity gunship that can function in zero-g situations. It is extremely difficult for ground forces to destroy such a craft as it can even withstand individual anti-air missiles. These craft are seldom found in the initial attack and are often located in the core group of any Khanid army, and are an extremely high-danger target. In space, these gunships actually have the ability to fight against fighters due to the Khanid's intricate web of communications.
Berzerker-B/3A1 Skirmisher
The more common type of fighter, offering superior speed at a very slight cost of agility and especially armor. They can hit hard, fast, and in numbers.
Berzerker-B/4A2 Brawler
A strange new variation to the B/3A1, these have the added ability to hack into enemy missiles and AI control systems while on the fly. This variation offers additional firepower and agility than its other, more common craft.
Berzerker-B/3 Stratosbombarder
Large, bulky, and can deliver heavy amounts of pain to whatever it shoots at, whether it be ground target or starship. A single one is bad news, nevertheless a swarm of them.