100,000 Years Ago…

"Tonight we've beaten our enemy, the greatest adversary of the Forerunners…the Empire of Man." The Didact said as he walked down accompanied by several of his Promethean guards.

He walked through the battered gate leading to the outside battlefield; the Didact was using his standard Promethean combat skin and a bright red cape showing his rank. As he came on the outside, several soldiers lined up on his presence…

"Lord of Admirals, it is an honor to finally meet you." The Didact said as he faced his human equivalent, Forthencho. He was tall, robust, white markings adorned his tanned skin, his hair was thick and long and his armor showed his rank…and experience.

"Didact, you have accepted our unconditional surrender." Forthencho said as the human soldiers behind him tried not to shoot at the Promethean Knights protecting the Didact. "I expected an emissary."

"For an event such as this, I was needed to be present. For more than millennia our species has been at war, at first we did not know why…but we can see that you ran from the Parasite." The Didact said.

"So you do understand the reasons of our retreat?" Forthencho said, hoping that the terms would be less severe.

"Indeed, but that reason alone cannot justify a millennia of war and death, Lord of Admirals. Normally the penalty for such act would be complete annihilation of the aggressive race for it went against the Mantle. But you showed bravery, even for a human, you showed respect and courage, Lord of Admirals." The Didact explained. "For that I won't be sending your people to the maw of oblivion, but taking your technology away from you. You will be made to start over again, to think over the use of your tools…the Librarian has made me reconsider my former opinion of you."

"And the Parasite?" Forthencho asked.

"We are Forerunners, guardians of all that exist. If the Parasite ever returns, we will be ready." The Didact assured him as he extended his hand. "Maybe someday we will meet again."

"As Lord of Admirals, leader of the military forces of the empire of man and Avatar of humanity, I surrender to you…Didact. We were once a great race, united in power and concerted in our goals…" The Lord Admirals said as he shook hands with the Forerunner. "…I will see you in the Spirit World."

The both mighty leaders looked at each other, once sworn enemies were now considering a possible friendship in the afterlife…

100,000 Years Later…Armory, UNSC Infinity

"Look at this armor, its awesome!" Bolin said as he looked at the Marine BDU he wore. "And its painted with my favorite color, green!"

"Could you please calm down, it's just metal over your chest." Mako said as he looked at his armor, he didn't like it. Then he saw an armor set in a nearby storage locker. "I'll take this one."

"Mako, we don't know if that is someone's armor set." Asami said trying to be gentle with the items in the armory.

"Ah, what's the worst that could happen?" Mako replied as he took the helmet from the set.

"That's an ODST Body Dress Uniform, given only to the top tier within the Marine Corp. The Orbital Drop Shock Troopers." Cortana informed through the Master Chief's speakers as the SPARTAN checked his Assault Rifle.

"Will it matter if I take it?" Mako asked.

"Eh, just take it." Cortana responded.

"Awesome."

Korra was already armored up; she wore the standard Marine BDU with her arms exposed, showing her Water Tribe armband. "Asami I think that you should use one of those rifle things over here." She said as she took a DMR from the crate in front of her.

"I think I will stick with the magnum." Asami replied as she placed her handgun inside its holster.

"Everyone ready?" The Master Chief asked as he stood up. They all nodded. "Follow me to the Pelican."

As they sat inside their assigned Pelican, Korra was beginning to get headaches.

"Korra you okay?" Mako asked.

"Just a headache, I'll be fine." Korra replied, she looked at her hands. Her vision was blurred…she closed her eyes to calm down.

Several ships exited slipspace, their location was a Forerunner colony world. Inside these ships, the elite of the Human Navy prepared to warn the planet of the immediate threat of the Parasite.

"Lord of Admirals, we are position over the Forerunner planet." One of the bridge officers informed the young war lord. He had been recently completed his training as both leader of the armada and as Avatar, master of the elements.

"Show me." Forthencho said as a hologram of the world appeared in front of him.

"Population numbering above 2 Billion, Forerunner ships on alert and inbound." The officer informed.

"Is it possible that we have arrived ahead of it?" Forthencho asked his naval assistant.

"Flood infestation detected, my Lord."

"Dammit! "

"My Lord…the infestation is in a remote locale." The analyst said. "Perhaps if we warn the Forerunners…"

"If we warn them we would be giving the Flood time to spread." Forthencho responded feeling immense pain and guilt for what he was about to do. "You know we have no choice."

He knew what would be the consequences of his actions but the risk for the infection to spread was too great. The galaxy needed balance, and as Avatar it was his duty to keep it balanced any way he could.

"Cleanse the planet."

And with it, the power of a thousand suns was unleashed on the planet below. Eradicating any and all lives that were on it…

Korra then opened her eyes; they were still in the pelican. A minute had passed but it felt like hours. What had she just seen? It appeared like it had been a past Avatar…but everything looked so far beyond her understanding, beyond what anything she has seen, even more than the UNSC itself.

Maybe everything will be answered once they confront the Didact…