“The Gorefast tends to live up to its name, so watch out for it speeding in towards you.” —Loading screen tip
The Gorefast is a specimen that appears on all waves of the game. It has a decent speed and will run at its targets when close enough. The blade it wields does quite a large amount of damage compared to most other specimens, 15 damage per hit on normal; something to be avoided. They have a tendency to travel in groups and can easily become fatal to players unable to escape their attacks. There is a greylisted Gorefasts-only mutator called Gored Fast packaged with the game.
The Gorefast appears as nude, hairless, dark reddish humanoid, lacking a jaw, genitalia, and most of its left arm; it being amputated just above the elbow. It also appears to lack skin, with the surface of its body resembling bare muscle. The blade protruding from its right arm, which is approximately a meter long, is wedged between the radius and ulna and extends between the middle and ring fingers of its mutilated hand, rending the hand in two from the wrist down. This is all held together by two tight leather straps found just below the elbow and just above the wrist.
During the Twisted Christmas update, it was reskinned as The Ginger-Fast. This skin depicts a typical gingerbread man, but with its left arm missing, and what appears to be a bite out of the right side of its head. It also has a toothed-filled mouth, and a pointed candy cane as its right arm. For the Summer Sideshow event, it was reskinned as the sword swallower. This skin depicts a pale, hairless, blindfolded male humanoid, who was impaled through the back with 3 swords, and had a sword rammed down his throat, resulting in a large gash down the front of his throat. He had a jagged blade attachment where his right hand should be, and wears tattered green trousers, but no shirt or shoes. As a side effect of the sword down the throat, it was impossible to visually decapitate the sword swallower, however the physiological effects remain the same. During the Halloween Sideshow event it appeared as a re-textured version of its summer sideshow skin; appearing with a red blindfold and a skeleton costume. The gorefast was reskinned as Lefty Jr. for the Hillbilly Horror event. Lefty Jr.'s right arm is missing and unlike the traditional blade like weapons of the past gorefasts, Lefty Jr. wields a banjo.
The Gorefast could by likened to a glorified Clot, but charging instead of grappling. A Gorefast picks a target based on proximity and steadily walks toward them until it's within a certain distance of them, at which point it will charge towards them, brandishing its blade ready for attack. It will change its target if another comes closer than its current prey, unlike some other specimens. It attacks by wildly swinging its bladed arm, and much of its body, around in the general direction of its chosen prey, inflicting moderate damage with each slash. If decapitated, in the time before it dies, it loses its ability to charge in a given direction and will still attack if close enough to a target. Whilst on fire, providing the burns are severe enough, it will start to thrash around with its arms flailing until it eventually dies or the flames go out. After this it will resume its normal behaviour, be it pursue one of the squad members or lie in a crispy pile of flesh. The Gorefast's primary blade swing requires it to stop moving while attacking. This allows a player walking backwards to evade being hit while the Gorefast is stationary.
 Historic data
The behaviour and statistics of a Gorefast in the final version of the Killing Floor mod were, for the noticeable part, the same as they are in the retail version of Killing Floor. The major difference, like most aspects of the game, was their graphical representation. In the mod their appearance was similar to that of the Clot in the mod, but with similar mutilations that of the current Gorefast; no jaw or left arm, but with a shorter, thicker, more growth-like blade attached to their right arm.
The original story behind the Gorefast is that they were the end result of a project similar to that of the Fleshpound, but toned down to an extent, designed to create extremely strong and fast soldiers. While the project was a success, the soldiers became insane, consumed with constant rage and an obsession with pain.
Like most specimens, it is advised to kill them before they get within range to use their blade, however, they are usually quite easy to dispatch. They can be easily defeated via decapitation, rarely requiring much more than a well-aimed shot with most weapons. Similar to the Clot, the Gorefast's head hit box tends to lie towards the throat and jaw, so players must keep that in mind when they go for the killing shot. More powerful weapons, like the shotgun can kill them in one or two good shots without aiming for the head. Killing them with melee weapons can require careful timing to avoid their blade, hit and run tactics work well for this. Gorefasts often briefly stop moving prior to striking the player.
They can quite often travel in groups, usually more Gorefasts or Clots; explosives can be useful in this situation. Alternatively, decapitating one specimen at a time and prioritising the closest one whilst ensuring that the player is not grabbed by a Clot is also viable.
 Wave distribution
 Total health
The base hit points of the Gorefast is 250; its total health on normal with one player, and for every additional player 37.5 hit points is added. This figure is then multiplied by 0.5 on beginner, 1 on normal, 1.35 on hard, 1.55 for suicidal, and 1.75 for hell on earth.
|Players||Beginner||Normal||Hard||Suicidal||Hell on Earth|
 Head health
The base hit points of the Gorefast's head is 25; its total health on normal. This figure is then multiplied by 0.5 on beginner, 1 on normal, 1.35 on hard, 1.55 for suicidal, and 1.75 for hell on earth.
|Beginner||Normal||Hard||Suicidal||Hell on Earth|
|Beginner||Normal||Hard||Suicidal||Hell on Earth|
 Gorefast SP
In the Killing Floor modification, there was data of an unused Gorefast named GorefastSP. Its purpose is unknown. It uses the Gorefast model, but, the difference is that SP is much faster than its counterpart. Its still present in TWI's Killing Floor. Where the Gorefast walking speed is 120, the SP's is 230. Gorefast's water speed is 140, the SP's is 220. The game data calls the Gorefast SP "Gorefast" making it difficult to know when they show up (Or killed) until they charge at you.