The Didact

The Didact was the Supreme Leader of the forerunners, a leader his whole kind respected and adored. He was in the total control of all political and military matters while his wife, The Librarian, was the head of the most important scientific research. Not much is know about him before the forerunner flood war. He was the one responsible for the firing of the Halo array.

Immortality and Slipspace accelerator engine
After Didact personaly lighted the rings from the Ark, he was left heartbroken when Librarian was consumed in the array pulse. After that it is know there was merely a thousand of forerunners left alive, not counting of course Humans, which still had no notion of technology. Te remaining forerunners left everything in the hands of humankind and decided to condemn themselves to further investigate the flood threat. Still believing the flood to be of extragalactic origin, the forerunner created a Slipsace engine that allowed them to travel 1000 lightyears in just 2 years. Forerunners, deciding not to procreate any more homo sapiens with the technology they have, leaving the humans to star over in the Earth, altered themselves to the point they were more machine than man, but, as expected, immortal.

Galaxy Exploration
The first galaxy explored by the now immortal Didact and his fleet was the Triangulum, in which they came across the bird-like Chozo civilization. The Chozo were merely on Tier 5, but they were already seeking wisdom and peace rather than war. The forerunners seeing they were already too sentient too be avoided had contact with them. The Didact liked the Chozo philosophy and it is believed the forerunners gifted the Chozo with some technological advancements.

The forerunners then encountered the Luminoth, another peacefull race of moth-like beings, the Luminoth. They were merely on Tier 6, so the forerunners could just past unnoticed. The amblics were also found by the forerunners, also at tier 6. Then, another shocking discovery. More Tier 6 forerunners, evolving almost exactly the same as the ones of planet Earth, again 100% genetic relation.

The Triangulum Galaxy seemed flood free, so the forerunners moved to the Andromeda Galaxy

Andromeda was almost completely desertic, planets with dead soil, not suitable for plant life, and almost no water reserves. Thousands of planets were found like these by the forerunners, and they eventually started to grow life on some of them by means of terraforming. After they almost had ended the full research on Andromeda, starving flood were fond on a desolated planet. Didact concluded that the flood had consumed the galaxy until it was left completely inhert, a process Didact worked for the folowing 50 years to make as many planets as possible suitable for life again. Eventually some bones and some warships were found deep below the soil of some planets, indicating the infestation started even before the forerunners achieved tier 1. Everything was too old too make any solid research out of it and after 50 years of terraforming, the forerunners left the galaxy and went into the Whirlpool galaxy.

Whirlpool infested Galaxy
It is here where the forerunner travels across the galaxies ended. The forerunners arrived and they found Interstellar level flood at their peek, with almost all sentient life defeated and assimilated. There, the forurunners run across the tier 1 Protheans, the ones that have been hopelessly fighting the flood. The forerunners formed a very effective resistance in combination with the protheans, seemingly turning the tables on the Gravemind. Didact induced fear on the Compound Mind, making it believe the forerunners managed to eradicate the flood on their galaxy with no heavy losses. This gravemind could never learn the truth about the array as they were cybernetic and the protheans were not told about the halo system, to give them hope, and to avoid gravemind from discovering the actual plan of the forerunners was to purge Whirlpool with a new array system. 35 yeas the flood were keep at bay, with the forerunner-prothean fleet constantly flanking the flood with heavy strikes.

With some of the prothean advancement a new halo array consisting of 9 rings with no terraforming to gain time was created in a matter of 20 years secretly. Only the top leader of the protheans, Brizka Supimo, knew of the array and what it was desinged to do.

Eventually an ark was also finished, and the fleet secretly vanished and went for it, but the gravemind followed. Soon the forerunners and Protheans found themselves overwhelmed. The Didact then enabled the self destruct sequence and the activation of the array, fully eradicating the flood on Whirlpool, but finishing for ever with the forerunner crusade and the Protheans altogether. The galaxy was completely purged with no surviving sentients this time, but animal and plant life managed to survive, unlike andromeda, so the possibility of life is still not lost.

The Didact's final Log Entry
The didact left distress beacons containing basic knowledge of the flood threat all across the galaxies the forerunners visited and before he died, he sent one last transmission in two beacons, one to the Earth (which was captured and later destroyed by unknown subjects), and one to the Chozo.

This is the Didact, the Supreme Commander of the forerunners. We were the ones responsible for the creation and firing of the mass destruction weapon, the Halo Array, that purged the Milky Way over 5 centuries ago. The weapon was fired to contain the biggest threat ever encountered, the parasitic life form know as the flood. We departured the galaxy and looked for more flood across the universe since we thought it was of extragalactic origin, and we were right. We came across the Andromeda galaxy, left completely inert by flood forces in the past, and the Whirlpool galaxy, which was almost completely infested by the flood, the only forces left were ours and that of the Protheans. We managed to purge this galaxy as we managed to create another array. Although there was no life to save at all, everything was already consumed, we stopped it to further spread. The only thing I learned is that as far as we know, we could be surrounded by millions of flood infested fleets, slowly approaching, and the Halos will not be a viable solution when our galaxy system is the only one left uninfected. We can't just kill them, we have to annihilate them. Cure them. It is the only way, or it will just come back until it finally consumes everything. I am typing this as the parasite approaches, trying to stop me from destroying it's presence here, but it is too late, another battle won, just to gain more time for anyone out there capable enogh to win the seemingly enternal battle agaist it. Didact out.