Halo series. Graphic novels

Two Clevelanders battle against a horde of alien invaders called the Covenant, who seek the legendary Key of Osanalan rumored to be in the city.

"Four Spartans. Team Black. Taken from their mothers' cribs, they trained side by side in a top-secret Navy program on the planet Reach. They formed a bond stronger than any civilian could conceive and no enemy would dare try to sever if they wished to live. And now they've crash-landed on a forbidding piece of rock floating in the middle of a well-known Covenant supply route. Two Covenant soldiers, Thon and Reff. Soldiers in the brutal war against...