Witcher

A witcher also known as a wiccan, hexer, vedymin, or witchman (Elder Speech: vatt'ghern), is someone who has undergone extensive training, ruthless mental and physical conditioning, and mysterious rituals (which take place at "witcher schools" such as Kaer Morhen) in preparation for becoming an itinerant monster slayer for hire.  

History

Creation

As humans settled in the northern part of the Continent, they had to deal with a vast array of monsters that inhabited the land and which humans were poorly equipped to deal with. To fix this, the Northern rulers tasked their mages to create magic-wielding warriors to deal with the monsters for them. As a result, the mages carried out experiments at Rissberg and the first witcher was created. Unfortunately, the witchers proved to have limited magical potential and were thus deemed failures and banished from the castle.  

The First Age of Witchers

After the witchers were banished they were brought to Castle Morgraig by a handful of mages who wished to continue the experiment. Here, the first generation of witchers continued to train while the mages created more, soon establishing the Order of Witchers. As the first five original witchers set out on the path, the first age of witchers began. However, over time, the Order, after being abandoned by the original mages, had a violent fight break out among their own resulting in several deaths and a schism, and with other witchers' growing disillusionment about their Order's purpose and leaving as well, eventually led to the Order's end when the final witchers abandoned Morgraig, and thus brought the first age of witchers to an end as well.  

Second Era of Witchers

After the Order ended and the five independent schools were built, the Second Era of Witchers began, which witchers themselves refer to as the Golden Age of Witchers. With the continent divided between the schools and each one creating their own witchers, their work became efficiently organized. Past tensions between them calmed down and when witchers from different schools crossed paths, no blood was shed as each knew they had their own territory, making them treat other schools more like estranged brothers than bitter enemies like before.  

End of the Golden Age

By the mid 1160s, the witchers had been too successful. Monsters grew increasingly rare and, due too propaganda from the churches of the North and the distrust of the rulers, witchers became the monsters in most of the population's eyes. The five schools each came under attack from various people and by the time the last school fell, the number of witchers had diminished greatly.  

Overview

Genetic advantages and disadvantages to being a Witcher

Taken in as children, witchers-to-be are subjected to intense alchemical processes, consumption of mutagenic compounds, and relentless physical and magical training to make them dangerous and highly versatile against their vast array of opponents, many of which possess superhuman speed, strength and/or other deadly powers. These procedures ultimately mean that each fully-trained witcher is a mutant built specifically to hunt and kill inhuman prey. The key permanent results of mutations shared by all witchers include:  
  • Sterility (which partially explains selection from the outsiders, as they cannot breed to pass on their traits).
  • Over developed libido, which caused many rumors to spring up about them.
  • Cat-like eyes that grant very acute nightvision - witchers can constrict their pupils to see in blinding light or open them to see in near pitch darkness. This nightvision can be further enhanced with the cat potion, but in general, it is good enough by itself to not require further enhancement. Their entire sensory system is overall enhanced, allowing them to identify the species of animal from the scent of their blood, and detect nearby beings even when out of sight.
  • Tremendous resistance to disease (which functions in most cases as complete immunity) and a boosted immune system, allowing them to consume large quantities of potions that could prove easily deadly if consumed even in small amounts by a normal man.
  • Exceptionally increased strength, speed, reflexes, and endurance, far beyond any normal or well-trained human, that allows them to swiftly end fights with minimal effort, and perform physical feats non-witchers couldn't hope to match. A witcher's physical skills alone are sufficient to defeat most monsters single-handedly if combined with extensive training and proper weaponry, whereas regular men could only hope to accomplish this in large groups. Witchers have also been shown to shrug off hits that would normally render normal men unconscious. Additionally, they have been known to survive the strikes of powerful monsters such as giants, or other beings possessing herculean strength, that would otherwise kill others with a single blow.
  • More magical potential than the average human, which gives them the ability to perform simple yet incredibly versatile combat magic in the form of signs. They also develop a sixth sense that allows them to "feel" things around them, be it items of importance or people's immediate intentions. This explains their uncanny ability to track and hunt people and monsters. However, the amount of magic they posses is not as close to sorcerers and sorceress.
  • Accelerated healing granting quick recovery from injuries.
  • Incredibly long lifespan and prolonged youth (The Witcher Vesemir is said to be at least a few centuries old but has the appearance of a middle-aged man).

Equipment and skills

Though they cover proficiency in basically any weapon that comes to hand, a witcher's training focuses on two primary tools:  

The Steel Sword

Traditionally, a witcher uses two swords, a steel sword for use on monsters not sensitive to silver or shelled so heavily that only the hard steel can harm them. The steel swords which witchers make for themselves (or contract swordsmiths to make for them, usually Mahakaman) are traditionally made from either meteoric or magnetite iron, and grant the weapon no superior or magical qualities. Some Witchers, however, does like to encourage the popular misconception that he wields a supernatural weapon, saying that it brings better pay for the work he does.   It has also been mentioned that the steel sword is often mistaken for being primarily intended for fighting hostile people and while it's true that witchers use their steel swords when fighting against armed opponents, this is only because a silver sword is a relatively delicate instrument. Striking metal armor or parrying an opponent's weapon will quickly ruin a silver sword, unlike a steel sword which can withstand such use with little to no damage.  

The Silver Sword

The silver sword only meant for certain kinds of monsters and other supernatural foes, like necrophages, therianthropes, cursed ones, shapeshifters, wraiths, and vampires. The steel sword would stand in when raw physical power is an obvious choice.   The "silver" swords which witchers make for themselves (or contract swordsmiths to make for them) are traditionally made from meteoric iron, which is then coated in silver and inscribed with magical runes. A purely silver sword would be entirely too soft and therefore useless. It is still very delicate however so witchers have to use them carefully - for example, crossing with another sword would easily damage it.  

Other Tools of the Trade

Witchers are also frequent mixers and users of powerful potions, having developed an advanced tolerance to their inherent toxicity, but still limited to a few at a time (even one of their weaker brews would be fatal to an ordinary human). witchers are trained to utilize bombs and coating their weapons with poison and oil many of them were designed to harm specific monsters. The first witchers were trained by alchemists from Vicovaro, moreover, witchers are master trackers being able to track almost all creatures be it monsters, animals, humans and nonhumans. The original witchers were trained by hunters from Kaedwen. After the varying schools were built the first generation witchers passed their knowledge to their apprentices. Finally, their formal magical training deals with signs, a low-level yet versatile form of magic that allows witchers to cast spells and enchantments with simple hand gestures. Without extensive improvement and practice, these are mere tricks compared to what a sorceress can do, but they serve very well for someone with a sword in one hand to add a variety of improvisation to their efforts. Also, the more powerful magic used by mages often takes a lot of time to prepare while all signs are instantaneous. Additionally, witchers are trained by seasoned mages in how to use these signs to the best effect. Several witchers from different schools utilized one-handed crossbows, however, it was not very common.   In general, a witcher is a formidable and often overwhelming opponent to more mundane races thanks to their superhuman physical prowess, regenerative capabilities, and magic. However, they are not infallible, as they can still make mistakes, take a misstep in battle against mundane men or supernatural demons, or be overwhelmed by sheer numbers and individuals who have the skill to match a witcher, though rare is the individual who managed to slay a witcher out of skill rather than dumb luck or by ambush.   Though a witcher's eyes are one way to stick out, another standard means of identification is the witcher medallion. This device aids in the detection of monsters, and no witcher would part with one willingly. (And of course, witchers are known for being 'hard to kill' - Leo Bonhart boasts a collection of three such medallions as proof of his martial skill.) The form of an individual medallion (head of a wolf, cat, griffin, etc.) indicates the school at which its owner was trained.   It is a common belief, even among witchers themselves, that they have no capacity for emotion. This may be debatable, and rather relative, considering the rigors of their training and the dangers they face on a day-to-day basis. Perhaps they have simply never had the time or exposure to society to develop or recognize the reactions to mundane experiences that most take for granted. It may also be explained that a combination of their hard training, genetic modifications, and seclusion from society that may encourage blunted emotional expressions, as Geralt, Lambert, and Eskel all exhibit emotional heights concerning love, joy, fear, anger, lust, and sympathy among various others.   Occasional references to witchers as 'nonhuman' are somewhat at odds with the original stories (in which Geralt only identifies witcher as a profession, never a race). There is certainly no official classification as such, and the relevant references (in the first game at least) are usually from Geralt identifying with the mistrust and/or hostility faced by elves and dwarves in human society. Likely it is used as a slur against the mutants, likening them to elves and dwarves, though it's worth noting that an in-game text found in Wild Hunt mentions that the Cat School of witchers "are for the most part of elven stock," indicating that there are (or were at one time) indeed nonhuman witchers. Whether or not there actually are any elven witchers during the contemporary timeline of the story is unknown.