I don't own the story, just a copy of the game.
"Arbitor, Arbitor, wake up! Wake up! Please! Get up! We need you! The Flood are coming this way! Hurry!"
The Arbitor stirred, but his nightmare was not over yet. "Lilandra! No! Damn you Tatarus! Please stop, take my life instead!" The Arbitor could only watch as his beloved's heart was torn out of her body and devoured by the Brute Commander. Her body then fell from the tower, landing on a sub-level, where it was consumed by a Flood. She picked up an energy sword and jumped up to the top level where Tatarus and the Arbitor were. The Arbitor made no effort to resist as she plunged it through his heart and stomach, and finally, beheading him.
Awaking suddenly, Arbitor felt a Flood parasite jump onto him. He shook it off and reached for his plasma rifle. He shot the vermin, causing it to explode. More parasites were rushing into his room now, and he filled the doorway with plasma bolts. His gun overheated and he threw it at a parasite that was going to jump on his second in command, Laager. He reached down into a footlocker and pulled out a plasma pistol and a needler. A few grunts had fallen to the ground and were being eaten by parasites, so Arbitor blasted each of them with a charged up blast from his pistol. After ten more minutes of such fighting, all the parasites were defeated. Roughly four elites and seven grunts had died, so their bodies were burned to ashes and placed in cremation jars to be sent home to their families.
The Arbitor, after calming down a little, stocked up on weapons, placing ten plasma grenades on his belt, a plasma pistol in a boot holster, a particle beam rifle across his back, clipped a de-activated energy sword to his belt and held a needler in each hand. Heading out with Laager, who held a carbine and a backup plasma pistol as well as four grunts armed with assortments of fuel rod cannons, plasma pistols, plasma grenades, needlers and stolen SMGs, they left in search of more Flood.
Activating three elevators, the Arbitor said, "Laager, take a grunt and scope out the mess hall on the third floor you're Alpha group. You three grunts are Beta group, go search the living quarters on the fourth floor. I'll be Zulu. I'm going to go to the second floor's control room and see how they got in. If you encounter any Flood, radio in and we'll come join you. Enter every room under active cameo."
With a ding, the elevators hit their floor. The covenant military hit their floors, closed the doors and listened to the Halo song on the way up.
The Arbitor picked up a disk from the desk next to the central computer. He inserted it into the Ж drive and was shocked. It was a human disk with blueprints of a device which seemed to bring a person infected by a flood back to life, using the flood itself to return the person's brain to normal. He took the disk out, put it in his pocket and opened up the central programming status system. A map appeared and showed the base's schematics, showing the activity levels in each room. They would show where the Flood were, and where they came in from. He saw that it was on the third floor, in the central hangar. Accessing the cameras in the hangar, he noticed that they seemed to be bringing in ships full of carriers and had a cargo ship carrying corpses.
How? The Flood are not intelligent enough to fly ships, much less co-ordinate an attack such as this! The Arbitor thought. Zooming into the driver's seat, the Arbitor saw something that chilled his blood and made him, a hardened warrior, brak down and cry. He saw a group of Fore-runners, and a Flood infested Tatarus holding his beloved Lilandra in energy restraints. Activating the camera's sniper function, he targeted the Forerunner pilot and shot him through the head. About to target another, a scream came over the radio.
"Laager!" The Arbitor shouted. He ran to the elevators blasted open the doors, climbed the emergency ladder and kicked open the third floor's doors and saw a Flood-infested humans. The Arbitor threw a plasma grenade at a group blocking his exit, but more filled their place. They, he heard the worst possible sound —the wooshing of an anti-gravitational elevator platform activating. Jumping out of the way and onto the platform, Arbitor dodged claws and managed to pull out his pair of needlers.
A Flood infested sergeant swiped at him, but was filled with two full clips of needles. Sticking a plasma grenade to its forehead, Arbitor chucked the body as far as he could. The creature landed at the end of the crowd and exploded, causing most of the Flood to either be incinerated in pink and blue fire or be thrown from their feet, unconscious or dead. The Arbitor managed to kick a large amount of them into the elevator and toss a frag grenade into it with them. Finishing the rest off with a needler burst, the Arbitor ran to find his friend. Laager had gotten onto a high ledge but was surrounded by beserking Brute-Flood.
"Damn these Flood! This could be hard…."