Metro: Final War

Artyom saved the metro when he destroyed the Dark Ones. What most didn't realize was this: That was Artyom's biggest mistake. The Dark Ones only wanted to help humans, but Artyom launched a barrage of missiles on their home. Now, after Khan has spotted a Dark One in the ruins, Artyom is ordered to hunt it down and kill it.

Bourbon was "killed" in Dry Station. He managed to survive, and took out the bandits. After heading back to the main metro tunnels, he heard about a Ranger who "saved the metro". Bourbon listened to the stories, and realized that this "Ranger" sounds a lot like Artyom. "Good work, Kid."

Pavel Morozov lived an interesting life. "Great, go to the Botanical Gardens, Blin. Comrade Korbut wants a mutant from here. A 'Dark One'. Apparently, this fucking thing can mess with your mind. I have a bad feeling about this."

Nikolai Kievskaya was born in 2014, and lived in the metro for most of his life. He signed up for the Red Army. However, after seeing what the Reds were really like, Nikolai decided to help the Spartan Order, from the shadows. Something Nikolai did not realize was that, he could hear the Dark Ones. Nikolai also didn't realize, was that he would embark on a journey. His fate decided the fate of the metro.

Alexis Riley was a US Marine. A hell of a shot. Her last mission before the war, was to try to extract a HVI from Moscow, and then, the bombs fell. Alexis headed into the metro as a mercenary. After hearing of a Ranger that "saved" the metro, Alexis decided to look for him, as he sounded like someone she'd fight beside.