Flood Juggernaut

The Flood Juggernaut is the name of a large Flood form found encoded in the Halo 2 disc.

It is named for its size and its power; the Flood Juggernaut is very large, about twice as tall as the Master Chief and Elites, and its mighty tentacles can kill most enemies in a single strike. The Juggernaut was created for Quarantine Zone as a means to stop the Enforcers and one can imagine that with its long legs and long tentacles, that it would have little problem snatching an Enforcer out of the sky and tearing it apart. The Flood Juggernaut can leap twice as far as the already impressive jumping capability of a Combat Form and it has the power of a tank.

Juggernauts were originally slated to appear in the levels The Oracle and Quarantine Zone. Although the model, textures etc. are stored in the same files as High Charity, there are no Spawn Points meant for it. As Bungie never programmed a death animation for the Juggernaut when it dies, it just freezes in place.

Flood Juggernauts have various features synonymous with Tank Forms. It has a small "waist" with 2 "connectors", its whips look a lot like it's brother's assault arm and its torso is huge. It is, however, much larger than a Tank Form, and seems better suited for attack. The characteristic "head" for a Pure Form is not there, however; instead it has a hole similar to a Combat Forms' "burrow hole" with several Flood tentacles emerging from it. These characteristics simply suggest that it is an early concept of the Tank Form. This is further supported by the fact that after the Flood create a Gravemind, they start to make Pure Forms once they gain the needed amount of biomass. This was the case during the major Flood outbreaks inside the Quarantine Zone and High Charity, here the Flood easily overran the confused strike forces at Quarantine Zone and the High Charity citizens. However, its lumpy, misshapen appearance suggests that the making of these forms was not perfected until the outbreak on Voi and later within High Charity.

Combat
The Juggernaut has two extremely large tentacles that can kill the player with only one hit. They also can jump much higher and farther than the regular Combat Forms can. While deleted, two spawn points were available for "modders" and PC Vista users, who can fight against the Juggernaut while in the beginning of the level High Charity. They often run around near the Pelican, and jump extremely high in the air at the player when noticed, sometimes landing on players, instantly killing them. The Juggernaut will also sometimes forget the player is there, and just stand still for a few moments. It is not advised that you find cover, as the Juggernaut will usually hit it out of the way, usually sending the object extreme distances. One of the best tactics is to run to the Pelican and get inside of it. The Juggernauts are too tall to follow you in, and will hover around the open door until you come out. The juggernaut appears to be very tough, resisting almost anything and making his death even harder to achieve, possibly making it go beserek. Hopefully, if you have picked up the Shotgun and/or Rocket Launcher you can make things easier. If not, you will have to rely on sticking them and whatever weapons you have.

Through hacking and fail safe modding, it has also been found that the Juggernauts have a defensive position; stooping and moving their whip-like appendages in front of their body in an X formation. It is unknown why such a powerful creature needs such a stance. It could possibly be to counter the sword or merely for looks. It may also be a form of a 'taunt' to lure players in. Note, that it looks like the defensive position of Hunters, although it is confirmed that the Juggernauts are not transformed from Hunters, as Hunters are immune to the Flood due to lacking a single central nervous system.

Trivia

 * The easiest way to kill Juggernauts is to lure them over the side of a cliff, although they do sometimes take the player with them.
 * The Juggernaut Form is not featured in any of the Halo games, but it is embedded in the Halo 2 programming and can be found via modding, similar to Huragok in Halo: CE. The Flood Juggernaut freezes in place when killed, due to not having a death animation. Had the Juggernaut been included in Halo 2, you would only have had to fight two Juggernauts in the whole game.
 * In the console command list in Halo 2 Map Editor of Halo 2 Vista, a command of spawning Flood Juggernauts was found.
 * There is also a high possibility that the Flood Juggernaut might be an early render of a Pure Form, as both are composed of a large amount of corpses' biomass.
 * The Juggernaut's legs have a resemblance to those of a Xenomorph from the famous Alien movie series, which Halo gained inspiration from.
 * Juggernauts aren't infected Hunters due to the fact that Hunters are made out of thousands of different organisms and not a single creature, hence making a Hunter impossible to infect.
 * The Juggernaut may be an unseen Flood form, but it actually exists. As it is mentioned in the Flood Autopsy article on Bungie.net, where it is categorized as an "Advanced Form" along with the Gravemind.