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|Other family:||Krieger (creator)|
“Not how, why? What made them do it? You know what I think? I think they get sick of being guinea pigs you know?”
— fragment of one of randomly generated mercenary conversations, from the level "Rebellion"
Trigens are beings that have been genetically altered by Dr. Krieger and his scientists in the testing of a mutagen designed to enhance the strength, speed, and endurance of humans. The experiments yielded good results in terms of strength and speed enhancement, but the mutation had a horrific side effect; all Trigens became horribly deformed beasts, and their minds got torn apart by an overwhelming primal urge to kill and feed.
They were at first kept in containment areas and cages in various installations throughout the islands, but were able to escape, and - in some cases - were intentionally turned loose by other Trigens. According to what Doyle says during the mission Treehouse, the event that sparked first escape of Trigens was Jack's destruction of the communication center.
The scientists wanted the specimens to be kept alive, even if they were loose and killing personnel, much to the horror of the mercenary force. Eventually, the mercs began to kill Trigens to stay alive and defend themselves but their efforts were in vain as the mutants soon overwhelmed the islands and celebrated in victory. One of the examples of anti-Trigen weaponry was the Nerve Gas.
Overall, the game implies that the whole process had three stages - Stage One, during which the first, non-human Trigens were created, Stage Two during which the development of human Trigens begun, and finally Stage Three. In Factory, Doyle mentions that during Stage Three Krieger got in such hurry, that he decided to take a lot of different live specimens, even going so far as creating Trigens out of zygotes, to create "vat-grown soldiers ready to fight as soon as they are born".
After Far Cry 1's action, all Trigens presumably died out and became extinct due to being unable to reproduce, as mutants and artificially created organisms tend to.
There are overall five types of Trigens encountered in the game, of which two come from chimpanzees and gorillas, and three that are derived from humans.
Trigens seem to have a simple hierarchy based on size. Bigger Trigens will give orders to smaller Trigens when searching for Jack. They can be divided into two categories - Small, and Big (Human-Like).
Small Trigens, dubbed "monkeys" by most of the characters come in two variants - the first one is a mutated chimpanzee, and the second one is a gorilla. Both are small and at first glance difference between them is purely cosmetic, althrough upon closer inspection it can be noticed that gorillas have slightly more health and deal a bit more damage than chimps, at cost of also slightly shorter jump length. Both types are small, but can shred through even a fully healed and armored Jack with just a few slashes, and are incredibly fast. They can leap upon a foe from meters away, and surprise enemies by moving through vents due to their small size. Chimps seem to be one of the most horrendously deformed Trigens, barely even resembling primates anymore, with reptilian-like muzzles, four yellow eyes, three-fingered arms and two-headed toes, with the only hair left being on their backs.
Gorillas are also barely resembling apes - they became totally hairless, their heads and jaws fused with their chests, and their deformed faces have bulging, bloodshot eyes. Their legs have two toes, and arms turned into giant, praying mantis-like claws. They are also called Aberrations.
This Trigen variant is also the first mutant seen in which it attacks and kills a lone mercenary who was running for his life. They appear in Research (cutscene only, gorilla), Treehouse, Bunker, Steam (chimps only), Control, Rebellion, Archive, Cooler, Catacombs and Dam.
Fast Trigens resemble humans, ableit with abnormally large and muscular legs. They normally carry fully automatic AG36 rifles, and have the ability to leap incredible distances. They move quite fast, and will swipe/kick at enemies that get too close, though this type of mutant as the weakest melee damage.
If a player happens to shoot a Fast Trigen when it is about to leap to another location, the Locust will struggle to jump, this is an incredible weakness of them, and gives the player a higher chance of killing one.
They seem to be the most intelligent Trigens out of all of them, in cutscenes they are even shown releasing other Trigens and rallying them to wreak havoc all over the islands.
Stealth Trigens are rarely encountered Trigens are fitted with experimental cloaking devices that allow them to become completely invisible, and they put this to good use. They will often remain cloaked until they are killed, but using the biothermal CryVision goggles makes them visible. They are armed with silenced MP5s, and will claw enemies that get close. They appear in Regulator (cutscene only), Archive and Catacombs.
According to what Doyle says in Archive, they are failed test subjects. They are technically the first human mutants player sees, as they can be seen in the first seconds of the Regulator cutscene, even before the first Fast Trigen shows up. They are not seen after Catacombs.
— One of the taunts of a Fat Boy
Fat Boys also called Mutant Cover in game files - these big, hugely muscular Trigens are extremely tough. Most times when they are encountered their right arms are mounted with missile launchers, but rarely, they are encountered with just their bare hands to fight with. When Jack gets too close, they will strike him with their claws, taking a severe amount of health away from the player.
Fat Boys have a glowing implant in their chests that devastates them when it is shot. These are the only Trigens that can speak, and they will growl things such as "You're goin' down!" and "Die!" when in combat.
Ironically, they are the least intelligent of all the Trigens, as best seen in the occasional instances where they may get stuck in a doorway and instead of taking another way around, will attempt to get free and kill Jack by repeatedly firing their launcher, killing themselves with a blast to the face from their own missiles in the process, since their shoulders are too wide to allow their arms (and thus the launcher) to fit through a doorway. If presented with a situation in which they cannot reach Jack, they will simply shoot in his general direction until something happens. They never flank enemies and always go for them head on. However, despite their shortcomings in common sense, they do tend to patrol, inspect areas that have unusual sounds, and will alert the other Trigens. They are also very deadly in confined areas, especially if Jack encounters a group of them.
They are characterized by their loud, lumbering footsteps.
They were originally supposed to posess different weapons, such as homing rockets miniguns and shotguns.
The last type of Trigen is Krieger himself, encountered in Volcano. He can make high and long jumps, can become invisible, throws grenades and swipes at you if you are too close to him. Like Fat Boys he has a very high amount of health and can withstand several dozen bullets before falling, tho one can use his buggy hitbox to fire at his crotch area to deal massive damage, killing him almost instantly. Krieger is very bugged, going so far as literally possessing no grenade throwing animation, just "spitting" them out of his chest.
“Congratulations, you have found one of the Omega-strain Trigens, Jack. That thing is a masterpiece of genetic engineering, it's the culmination of Krieger's research. The ultimate supersoldier! From the current data I processed...looks like he's turning him into some sort of mobile artillery.”
— Doyle's unused sound file
Inside the game files are leftover files of two unused mutants - MutantOmega and MutantWorm, one resembling a Fat Boy with two additional rocket launchers, and one looking like a giant snake-like or worm-like creature. They are both untextured. Game's coding also has references to three other unused mutants - MutantCover, MutantRear and MutantScout. MutantCover and MutantRear posess textured models of their corpes in-game, with MutantCover greatly resembling the Fat Boy, albeit with slightly different design and a homing rocket launcher (according to in-game unused weapon coding called "CoverRL"), and MutantRear looking like a human with a prolonged neck.
Early sound files that indicate that the player would have to see Mutant Omega, called "Omega Trigen" in Factory can be found in the "compound" folder, from compound_specific_F3 to compound_specific_F7. The Trigen is described as being "asleep".
One of the most known cut mutants, is the one labeled as "Screwed". It is not cut completely, as it's seen in Bunker on a table and in the cutscene preceding Dam. Along with Omega, it is the biggest mutant, with a big blade on the right arm. It also has a big mouth on its face. In Bunker, a Lab Worker was performing surgery on a Mutant Screwed but the operation was halted by Jack Carver. It is heavily implied that it's the missing link between human Trigens, and monkey Trigens.
Mutant Screwed can be placed in the editor, but has no animations, moving after player and glitching up while in melee range, dealing massive damage much like the small Trigens. His other, alternative name is "Mutant Berzerker". MutantRear is programmed to act like a Stealth trigen, while MutantScout is programmed to be a Fast Trigen, both with unfinished programming. The game was also going to feature two more primate-based Trigens, including a baboon and another, "flat-faced" Chimp model of which can be seen as the hologram in Cooler and Volcano.
- Fat Boys seem to switch between two voices - one being lower in pitch and composing mostly of yells, damage and death sounds, and another one, much more growling, harsh and human-like, able to even form sentences. The second voice, still called Mutant_Cover in game files has a full, almost unused voiceset similar to that of the Mercenaries.
- All human-like Trigens, excluding Krieger, seem to lack lips.
- Despite appearing first time in Research Trigens are actually foreshadowed as far, as in Training in the Mercenary camp, appearing on some photos. Some mercenaries also vaguely talk about them, even speaking about a "huge rat" that seemed to be a "mutant".
- According to one of the conversations of the mercs that can be heard in Fort, failed Trigen corpses are fed to sharks.
- According to another one from Steam, scientists allegedly make meat out of Trigen corpses.
- Despite Trigens being fleshy-red in colour, according to Doyle in Dam, one of the first signs of turning into a Trigen is your skin turning green.
- The Trigens bear some resemblance to several enemies from other popular videogames of that time. The simian-type Trigens resemble the demons from Doom 3, the chimpanzee Trigens resemble the Fiends from the original Quake, the human-type Trigens resemble the Strogg race from the Quake series and the Fat Boys resemble a cross between the Cyberdemon from the original Doom games and the Tank from Quake 2.