The Combine is a robot in the game "The Stalker'' which originally came from Half-Life. Everyone else that is not the Stalker will be chosen as the Combine. The Combines must use their wits and weapons to survive and kill the Stalker with their firearm. Additionally, VIP people have the power to choose Upgrades, which can be very useful in defeating the Stalker.
The Combines are a part of Unit 8, a robotic community, and their only job is to destroy the Stalker. Their appearance is basically someone wearing a dark-grey robotic suit with glowing yellow eyes. The Combines are usually armed with guns and wear hats too.