Raze 3 has a total of 49 weapons, 10 of which are Premium weapons. The player can carry a max of 5 weapons during gameplay that are divided into Side Arms, Automatic Weapons, Close Range, Long Range, and Explosive. Raze 3 features new weapons, some of which are derived from the first 2 installments. The story involved in the alien campaign is nearly the same as in the human campaign, but viewed from the alien perspective. The ERT soldier continued fighting and became a living legend that led the Raze team throughout the years of victory. They later would remove any existing threats before it could cause harm. The aliens were later kept at bay, and the ERT soldier, with the knowledge from the future, warns the military about the Harvester. But Ghost, at which time unveils her true identity as a female, shot the alien with a sniper rifle, disabling the alien completely. The alien tries to kill an ERT soldier (the player) by strangling them. Knowing this, the Raze team tries to kill the super-powered alien as they could, only to be brought back in time, even far before the humans discovered the presence of aliens.

The alien grows nearly double in size with extreme damage resistance, as well as obtaining an ability to control time. The Raze team eliminates all aliens and destroys the Harvester by exploding it, but this triggers a leak in the system, spilling out glowing blue liquid pouring onto a still-surviving alien. The aliens tried to activate the Harvester as well as fend off humans trying to stop it. An all-out attack is launched, but the Raze team couldn't manage to fight back and the Harvester is stolen. The samples are brought back to the labs, but the aliens have found out where the Harvester is kept. The player takes care of the 'infected' specimens alone, and then goes with the Raze unit to gather plant samples on the ground, which is now covered with alien life that has been converted from original Earth species by the machine, also known as the Harvester. However, the machine ends up causing some specimens to go berserk, killing the scientist and getting out of their containment units. They bring it to the private labs in the sky to be studied. They are covered by sniper fire from Ghost as the team evacuates with the machine. But soon, the ship crashes and the team must defend themselves until evacuation arrives. The unit boards the ship that the aliens are traveling on, and launch an attack. After fighting the zombies off, the aliens are trying to escape with the machine. The ERT soldier took them above ground, when some of the ERT personnel sent to find the Raze unit turn into zombies. In the battle, the aliens were fought off successfully, and the team recovers vital information, as well as a strange machine that was causing tremors, when they are rescued by an ERT soldier. There, they accidentally let some aliens hear them, and were attacked. After eliminating the zombies, the team tracks the aliens in a mysterious underground facility.

They believed that the aliens had been wiped out years ago. While clearing out a mass of zombies, an alien arrives, much to the team's amazement. The aliens have been clearing zombies from their slums hidden in Vietnam in order to activate a new super weapon: the Harvester. The overarching story is of a squad of Raze soldiers who discover an alien presence left on Earth with the zombies left over from events of Raze 2. Like its predecessors, Raze 3 has two campaigns with different stories: one of the humans fighting to save Earth, and one of the aliens fighting to conquer Earth. Or become the enemy and fight to destroy it by becoming the Aliens. Customize your character and arm yourself with a vast array of weapons, equipment and abilities and fight Aliens, Zombies and Robots to save the Earth alongside some of your men.

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