[Série] Doom

Dramatic increase of gibs creating a much gorier atmosphere.
3D bloodspots allow all textures to be covered with blood, including the floor and ceiling.
A more dynamic interface. For example, blood splashes on the screen if the player kills
an enemy up close, and glass cracks and/or bullet holes may appear on the screen when you get injured.
New death animations for all enemies. Body parts can be torn apart by regular fire on various locations on the enemy's body, cut in half with the chainsaw, melted with the plasma gun, burnt into smoky scorch by fire or electricity-based attacks, and reduced to tiny pieces by explosives.
Corpses can be further mutilated upon death.
Many enemies have new attacks (more details below), and many enemy attacks do up to twice the normal damage.
Many of the game's weapons have been altered or tweaked in various ways, such as by making it necessary to reload or by adding secondary functions (see also below).

Additional changes

The berserk pack's functionality has been expanded. With it, beyond recovering player's health back to 100% (if it's lower than that), the player can perform fatalities on monsters, as well as grab Lost Souls and explosive barrels and throw them. Also using the berserk pack, the player can pick up stunned zombies and imps (a "stunned" monster will have had one of its limbs blown off and be kneeling on the ground) to use as meat shields against projectiles.
Implementation of headshots for all monsters - except the Cacodemon, Lost Soul, and Pain Elemental. Headshots deal as much as double damage (depending on the weapon), and can gib the monster's head for one of many special death animations (see below). Autoaim does not assist in getting headshots.
Invisibility spheres are replaced with captured marines. If the player punches or kicks the marine, he will be freed and will attempt to fight against the demons. The captured marines hold random weaponry, with multiple playthroughs of a level resulting in differing weapons that the marine will fight with. The demons around the captured marine will attempt to kill him before the player can free him.
If the player kills certain monsters with the chainsaw or rocket launcher, they can pick up their weapons (for example, the Mancubus's flame cannon or the Revenant's rocket launchers).
Enhanced lighting and shadow effects for decorations and projectiles similar to the Doomsday engine.
Bullets now act as projectiles, albeit very fast ones, allowing the player to dodge them with sufficient distance.
Your fists are faster and can make quick jabs at enemies. They are also a silent attack and will not alert enemies. The alt-fire launches slower but more powerful hook punch. Punching a Zombieman, Shotgun Guy, or Imp from behind before the enemy has noticed will snap their neck, killing the enemy instantly without alerting others.
A kick attack has been added to shove enemies away from the player, similar to Duke Nukem 3D. It can be bound to a specific key.
The chainsaw uses the Doom 3 Chainsaw sound effects and blood splatters on it when sawing an enemy.
The pistol is replaced by an assault rifle, matching the player's sprite, which unlike the original pistol remains useful even late in the game. The assault rifle has a decent fire rate (close to the original chain gun) and is one of the most accurate weapons in the mod. The alt-fire mode allows the player to aim down the sights to snipe enemies. It has a clip size of 30.
The shotgun has a black synthetic pump and stock instead of wooden ones, and also has a vented heatshield on the barrel. Like the assault rifle, the sights can be used for more accurate shots. The shotgun also fires ten pellets per shot to match the Super Shotgun's 20.
The Super Shotgun has a slower reload time, but at point blank
Player killing an Imp via shotgun blast headshot. Notice the monster's gibbed head.
range will deal an additional damage boost. It now has the option of firing only one barrel at a time, thus shooting 10 pellets.
The chaingun is now correctly referred to as a minigun, and fires 50% faster but also requires a spin-up and cooloff before and after firing respectively, similar to the plasma gun. The alt-fire mode makes the barrels continuously spin, further increasing the firing rate but also drastically decreasing the accuracy and alerting monsters.
The rocket launcher has a slower rate of fire but causes 50% more damage on a direct hit. It must be reloaded after 6 shots.
The plasma gun now deals double damage, can cause minor splash damage to enemies (and players, if the bolt hits a nearby wall). The alt-fire mode allows the plasma gun to fire a spread of plasma bolts in a shotgun-like spread, which can do as much damage as two rockets. The plasma gun must be reloaded after 50 shots.
The BFG9000 uses the Doom 3 BFG9000 sound effects and the primary energy ball deals double damage. Instead of the original BFG's hitscan tracer attack, it simply deals damage in a very large radius. It can also fatally injure the player if the ball explodes too close (only applies if it hits an inanimate object and not an enemy), again unlike the original BFG.
Wolfenstein SS Nazis will drop their MP40 sub-machine guns upon death, which the player can use for himself. The MP40 has a higher rate of fire than the assault rifle and a 32-round magazine.
Shooting bullet weapons close enough to a wall will cause you to be hurt by shrapnel.
Most weapons cause kickback, especially the Super Shotgun and the BFG9000.
The player is able to flip monsters off by a bindable command known as "Offend." This command will alert nearby monsters as if the player had just fired a weapon. There are other bindable commands, such as "wave". Pressing the wave button during a fatality (see below) will allow the player to see his own wave animation in third-person.
The player's ammo capacity for bullet weapons has been increased from 200 to 300 (and from 400 to 600 with a backpack).
Both the grenade launcher and the railgun from the Skulltag source port have been given new sprites and attributes. The grenade launcher is a standard M79 grenade launcher with much larger blast radius than the rocket launcher. The railgun fires at a slower rate than the Vanilla Skulltag railgun but uses half as much ammunition and reloads after 5 shots instead of 4.
Sprite change of rockets and box of rockets, backpack, armor bonus, armor and megaarmor.
Former Humans will sometimes rapidly fire off 5 shots without pausing. Also, both he and the former sergeant must stop to reload their weapons after a while.
Shotgun guys now fire 8 pellets per shot instead of only 3.
The Imp has a leap attack like the Doom 3 version of the Imp.
Spectres are completely invisible save for their eyes, making them much harder to detect. When a Spectre is killed, a strange kind of red aura "smokes" upwards from its corpse, rendering the felled monster completely visible.
The Cacodemon can shoot two projectiles in a short amount of time, and can shunt itself out of the way of incoming attacks.
Arachnotrons are much larger, around the size of a Baron of Hell.
Arch-Viles are less powerful, as their attack takes longer time to charge and they have less hit points, however they can resurrect enemies without having to stop and face the monster's corpse. Their appearance also changes, as they now sport large ram horns.
Pain Elementals explode upon death, causing heavy damage to nearby monsters and the player as well.
Some of the stronger melee-oriented monsters, such as the Baron of Hell, will perform fatalities on the Doomguy and even other monsters if they kill them with a melee attack.
The Baron of Hell has an attack where it can launch 3 projectiles in a wide spread instead of one. The animation for this tri-spread attack is shown by the Baron clapping his hands together instead of his usual sidearm throw.
The Cyberdemon has gained a new melee attack: a devastating stomp, which against the player is almost always an instant kill. In addition, it shoots faster and for longer (four missiles instead of three) in a wider angle and has a limited ability to lead its shots against circlestrafing players. The screen will also shake when a Cyberdemon's rocket impacts near a players position, the closer a player is to an impacting rocket will mean a more intense screen shake The death animation is enhanced, upon being killed the Cyberdemon explodes far more violently than before, so much so a player too close when one is killed can be badly hurt or killed by the explosion. Likewise other monsters can be hurt or killed by the explosion, except for another nearby Cyberdemon or Mastermind.
The Spider Mastermind's minigun is now a high-calibre gatling gun loaded with explosive rounds. Also, the monster begins firing immediately instead of pausing for a second upon engaging its target. The screen will also shake when a Mastermind opens fire on a player, again, closeness to the monster or impacting fire varies shaking intensity. It's death animation is also enhanced via exploding violently when killed which can badly hurt or kill a player or other monster too close to the blast. The same exception applies, another nearby Mastermind or Cyberdemon are not affected by the blast.
Decorative props, such as trees and and lights, can be destroyed.
Marines and monsters now wade through a liquid instead of walking on it, also wading through liquids causes a splashing sound to be played. This also happens to liquid, when a marine or a zombie shoots it. The various liquid textures are also enhanced.
Enemies may drop demon strength runes upon death, which act similarly to berserk packs.