Warhammer: I am the wave

In the distant 41st millennium, countless races wage war within the galaxy. The hungry Great Devourer has already extended its tentacles here. The former galactic overlord is gradually awakening, while whispers from the warp grow ever more intense. Alexei stumbled into this cesspool of a universe by accident. Watching the heroes and warriors butcher each other across the galaxy, despair filled his heart. “I was just joking! I never meant to pledge loyalty to His Imperial Majesty!” Good news: Alexei acquired a system. Bad news: He resurrected in the Hiveworld, and the system's first summon was the Zerg from StarCraft II... As Alexei watched the zergling and roach swarming around him, along with the zergling swarm flying overhead, his despair deepened. “Damn it, this really is a blessing from the Emperor!” — Description from novelcodex.org