I do not own Alien, Predator or Halo.

In the depths of the planet designated LV-1201, within the jet black organic tunnels, all was quiet. Between the decomposing bodies stuck to the wall, and the husks of empty eggs and dead facehuggers, the hive of xenomorphs slept soundly, blissfully unaware of the eldritch horrors massing above them.

That bliss was soon shattered by the sound of explosive blasts echoing through the surrounding tunnels, followed by an ear-splitting roar of the unnatural abominations. Rudely awoken from their slumber, the hive awoke in a rage, with dozens of xenomorphs screeching angrily in response to the incursion into their domain. To any other living creature, the cacophony caused by the enraged screams of two animalistic species would be absolutely deafening.

Slithering out of their hive like a column of massive black ants, a horde of xenomorphs charged towards the beings who dared to enter their home. The sides of the tunnels went from a dark gray shade to a jet black, as the xenomorphs advanced towards their new adversaries.

On the other side of the cavernous tunnel system, vomit-colored creatures were emerging from cracks scattered through the stone passage. Shambling towards the mass of xenomorphs, the Flood poured into the caves, determined to drown these insects in a sea of bodies.

The first combat form rounded a bend, running right into the center of the alien horde and was quickly torn to pieces as a result. The Flood unleashed a hailstorm of weapon fire at the xenomorphs, mowing them down by the dozens. Despite the speed and reflexes of the Flood, the aliens were considerably faster, and soon the warrior bugs leapt into the mass of bodies.

The tunnels became thick with flying limbs and showers of blood. There was little need for any sort of finesse: a single xenomorph could flail all of their limbs wildly and tear through the combat forms with ease, and many of them did just that. Mobs of Flood were cut down by the aliens, who were absolutely furious at the parasites that had chosen to invade their home.

Infection forms leapt at the 8-foot tall creatures, attempting to burrow into their chests and turn the xenomorphs against their brethren. This became a disadvantage to the Flood, as the corrosive effect of xenomorph blood literally melted the infection forms and any other Flood forms that they touched.

Despite the brutality of the xenomorphs, they soon lost ground to the relentless nature of their opponents. Living up to their namesake, the Flood kept pouring into the catacombs, and soon the animalistic slaughter reached the honey-combed structure of the xenomorph hive itself.

Enraged by the deaths of her children, the Alien Queen emerged from her chamber and hurled herself at the Flood, reducing hundreds of them to smears coating the walls of her nest. This magnificant display was short-lived, as the Flood responded with a barrage of energy weapon fire, literally shredding the Queen. The shock of their mother's death spread through the alien hive mind, crippling the remaining aliens and allowing the Flood to finish them off.

With the deaths of the xenomorph horde, green mist started drifting into the tunnels, slowly turning the organic Xenomorph nest into a Flood Hive.

Meanwhile, far above the events in the hive, another battle was raging, this time between the Flood and the Yautja. Perched on the remains of the old Weyland-Yutani Forward Observation Pods, ten Predators were fighting against an army of Flood.

The scaffolding from the pods had remained relatively intact, allowing the Yautja to focus their plasma caster fire on the pure forms crawling up the remains. Combat forms that escaped the plasma barrage were cut down by other Predator weapons.

Ka'vanti was one of the Yuatja warriors here, on a hunting trip gone horribly wrong. When he and his clan arrived, they had no idea that the Flood would also arrive here, and a (relatively) relaxing xenomorph hunt became a desperate fight for survival.

As a plasma bolt blew another combat form to bits, Ka'vanti found himself under fire from a ranged form. Dodging the sharp needles erupting from the creature's back, Ka'vanti shot a net at the ranged form, enveloping it in a thick mesh that would slice the abomination to pieces.

Turning around, Ka'vanti unsheathed his wrist blades in time to shred an infection form that had snuck up behind him. One of his clan mates was less fortunate, as a mass of infection forms buried him and started corrupting him. At that moment, Ka'vanti's clan member was enveloped in a blue sphere of energy as his self-destruct system activated, preventing the Flood from using him.

Ka'vanti knew that the upgrade was a necessity against the Flood. After encountering the parasite several times before now, the Yautja had deemed it mandatory that all Hunters should have their self-destruct system keyed into their nervous systems. If Flood DNA was detected in the Predator's system, the wrist gauntlet would automatically trigger a low-yield explosion that would vaporize the Hunter's body, preventing the Predators from being turned into Flood hosts.

Ka'vanti turned around in time to see another of his clan crushed by a worm-shaped Flood combat form. Several plasma bolts and a well-aimed smart disc brought the monstrosity down, only to find that dozens of them were crawling up the slope.

Hearing a warning growl, 7 of the remaining Predators ducked as the eighth Yautja unleashed a massive energy beam from the Blazer harness mounted on his back, annihilating scores of Flood with each sweep of energy. The Flood responded by concentrating all their fire on the Blazer, who found himself hit by a dozen sniper rounds, followed by a rocket.

This ignited the Blazer's core and overloaded it, vaporizing the Predator wielding it. Miraculously, the remaining Predators all survived the blast, but found themselves in a perilous position as the scaffolding they were standing on had broken loose from the explosions and was straining underneath all the weight.

Due to their compromised positions, the Predators found themselves picked off one by one, until Ka'vanti was the only one left. Unleashing plasma bolt after plasma bolt on the horde of Flood below him, Ka'vanti struggled to climb up the side of the cliff, as his blood seeped from his shoulder from the massive metal spike that had been jammed into it.

As he was nearing the rise, Ka'vanti saw the cliff was covered with Flood forms as the parasite had spread across the entire continent.

Now realizing that escape was impossible, Ka'vanti crouched down on an outcropping and turned to his wrist gauntlet. Keying the activation buttons, Ka'vanti first sent a transmission warning about the escape of the Flood, then he activated the self-destruct system on the clan's ship and his wrist and set the blast radius of both to maximum.

One last swipe of his finger started the timer and Ka'vanti looked down towards the mass of Flood gathering below him. Biomass was growing on the center of the valley, apparently developing into a Gravemind.

With his final act, Ka'vanti leapt towards the developing Flood form, plummeting 800 meters before the timer ran out.

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