Operation: Massacre The Dead

There are a massive squad of twelve survivors, pretty much of any species, sent out into a trainyard at midnight from a tunnel. The trainyard is well lit by post lights, fortunately. There are mountains surrounding the trainyard, and two large buildings between a dirt walkway with warehouses inside, some causal rooms, offices for security, and some vending machines with supplied food and snacks so survivors don't starve. There is also a small bridge connecting both building's upper floors, allowing survivors to walk from one building to the other one. There is also a small roof section besides the upper floor where the warehouse would be below, and this roof can be dangerous due to particular reasons.

As for the infected, the first types are the common infected. They are the infected you'll always see; gray skin, glowing white eyes, and move rather erratically and rabidly. Fast, but very fragile and can be taken down in a minimum of one or two shots. Though, sometimes a Horde can appear due to particular reasons. They can be handled well most of the time, because fifteen survivors is ample for handling a Horde of common infected.

Then, the special infected. The special infected are infected that have received mutations and unique abilities, making them stronger.

The first ever special infected is the Boomer. The Boomers are morbidly obese infected, who vomit a volley of bile onto the survivors once they get close enough. They are VERY fragile, and if shot in the gut, it instantly bursts into a spray of the bile. The bile, if on any survivor, will attract small groups of common infected and cause common infected to target them due to the smell.

The secondary special infected are the Spitters. The Spitters are zombies with elongated and unhinged jaws constantly leaking acidic goop, which they spit beneath a survivor's feet to plaster that ground with the acidic goop that will hurt a survivor very badly if they stand in it. Their stomachs are also slightly bloated from producing all the acid, but surprisingly remain intact. They aren't very bad either, going down in just a few shots, but it's better to get away once one dies because it then releases it's own acidic goop under it's dead body if killed. The acidic substance usually goes away after staying on the ground for more than 7 seconds.

After the Spitters come the Hunters, who are the sole reason why roofs are dangerous to stay on or be isolated from your group. These zombies are known to be quite stealthy and silent, targeting isolated survivors, often growling slightly but give a warning screech when they crouch on all fours. They are known to pounce at incredible distances after crouching, often letting out a powerful scream when they do. Once they pounce onto a survivor, they will then viciously maul them. This can kill the survivor in a minimum of 20 seconds if they're left behind. And since they're agile, they're fragile.

After the Hunters come the Jockeys. Jockeys are smaller, hunched infected with short statures, and are constantly laughing, cackling, and chuckling, likely in a state of extreme mania and psychopathy. They also leap, like Hunters do, but not as high as the Hunters do because they don't have enough leg strength. They pounce onto survivor's backs and steer them around in a demented piggyback ride, all while laughing like a madman. They are also quite easy to take down.

After the Jockeys are the Smokers. The Smokers are tall, lanky infected, known for having grotesque growths on their face with tongues growing out of them. It's own tongue is extremely long and used like a grappling hook to ensnare survivors from afar. Once having caught a survivor, they'll reel them in and if successful, will then start beating the survivor until they eventually die. The Smokers are slightly tougher to take down but if chased down, they can be killed easily or caught offguard.

After the Smokers come the Chargers. The Chargers are the more bigger special infected, and known for being beefy and having singular overgrown arms they rely on as battering rams to bowl through survivors like a runaway freight train. They are hard to take down, and swing hard too, able to stagger survivor's with their hits, but if overwhelmed by a barrage of gunfire, they fold pretty quick.

Then, the most feared special infected, known as the Tank. The Tank is an enormous infected standing at 10 feet tall and 7 feet wide, and weighing 3000 pounds. It's upper body suffers from an immense growth of muscle due to hypertrophy, causing the muscles to be hyperdeveloped and rock-hard, and it's arms reach down to the ground while it's torso itself is 4 feet wide in diameter. The Tank's lower body however, is completely fine, only a little bit affected by muscle and it's pants remain intact. Due to this contrast, the Tank walks hunched over on all fours using it's knuckles to support it's legs like a gorilla, also running like this aswell and being surprisingly fast for it's size. The Tank, unlike other infected, has red-hot, bloodshot skin with rashes and burn marks. The reason it is fast despite the sheer scale of it's body is due to it being in a state of constant unbridled, immense rage. This extremely intense state of rage is caused by the muscles putting severe strain on the Tank's immensely dense, thickened bones, especially squeezing the brain which is the root cause of the overwhelming amounts of rage. The Tank is known for it's exceptional strength; being able to smash through walls, launch survivors like ragdolls with it's punches, and even tear pieces or rubble to throw at survivors that are afar from it or punch obstacles in it's weight range towards the survivors to incapacitate them. Living up to it's name, the Tank is nearly unstoppable. Bullets don't slow it down or hurt it much, explosions barely leave a dent, and blunt force is deflected back. It's sheer scale alone shakes the earth around it. The Tank only appears during the finale.