Eternal Enemies

It is the year 2561. After the end of the Human-Covenant war, the Sangheili had returned to their home planet as allies to the UNSC. But there were those whom did not think well of this alliance. One such group was known as the Fallen. They had made intense but peaceful debate with the Sangheili politicians, and started open war two years ago.

Not long after the Fallen was established in 2553, the Forerunners themselves had revealed their long-hidden existence, and had been narrowly defeated by humanity and the Sangheili. However, the Fallen had managed to capture a vast amount of technology, and had researched it, biding their time. Now, with a deadly new power, they unleash their deadly secrets upon their eternal enemies, and it is once again up to the Spartans of the UNSC to find the the source of this technology, take it from them, and bring it back. Little do they know, their old enemies, the Jiralhanae, also had plans for it...