Dark Times

The Dark Times, (PROSE: The Five Doctors, The Pit; TV: The Runaway Bride, The Infinite Quest) Dark Ages, (AUDIO: Call Me Ishmael) or simply the Dark Time, (PROSE: The Eight Doctors, Cat's Cradle: Time's Crucible; TV: The Infinite Quest) also poetically referred to as the time before time (PROSE: Cobweb and Ivory) or "time before this" (PROSE: Christmas on a Rational Planet) were a time of chaos and monsters that predated the Doctor's reality, (TV: The Infinite Quest) The universe during this period was sometimes known as the Protoverse. (PROSE: Contributors)

Remembered by the Tenth Doctor as "the millennia that came creeping out of the endless night as the first stars switched on in the universe", (PROSE: The Knight, The Fool and The Dead) they were a time of chaos which not only predated Time Lord history, but was also "before there was any such thing as history", and where the laws of time and reality of the later universe did not apply. (AUDIO: The Enemy of My Enemy) The terminology was fluid across accounts, however, and some equated the "Time before this" with the "Old Time" but not the "Dark Times". (PROSE: Christmas on a Rational Planet, The Quantum Archangel, Weapons Grade Snake Oil) Some accounts defined "the Dark Time" as being an era localized to Gallifrey in which darkness grew in Gallifreyan society, but as having occurred within "the Old Time", specifically towards its tail end. (PROSE: Cat's Cradle: Time's Crucible) Other sources still indicated the Dark and Old Times were distinct eras of Gallifreyan history. (PROSE: A Brief History of Time Lords)

In terms of universal history, the Dark Times were billions of years before the 21st century (TV: The Runaway Bride) and in part aeons before the rise of Gallifreyan civilisation. (PROSE: The Knight, The Fool and The Dead)

The Dark Times were a prehistoric period in Gallifreyan history. (PROSE: Introduction) Rassilon created the Time scoop in the Dark Times, (PROSE: The Five Doctors, The Eight Doctors) and his rise to power and foundation of Time Lord civilisation ended the Dark Times, (PROSE: Cat's Cradle: Time's Crucible, A Brief History of Time Lords) with the anchoring of the thread and Time Wars eradicating the monstrous creatures of the era and creating the Web of Time. (PROSE: The Infinity Doctors, So Vile a Sin, et al, TV: Once, Upon Time) After this, it was believed Time Lords were unable to time travel to the Dark Time, (PROSE: No Future, Goth Opera) but multiple incarnations of the Doctor would do just that. (COMIC: Old Girl; PROSE: The Guide to the Dark Times)

Nature
Before the Time Lords created the Web of Time, the universe obeyed no laws of physics, and magic was a powerful force. (PROSE: Christmas on a Rational Planet)

According to the Eighth Doctor, "time was but a tributary" by Mount Perdition during the time of Pythia's Curse. The Stranger worked to turn it into a stream. (AUDIO: Patience) Before the creation of the planet Time, the force of time still ran wild. (TV: Once, Upon Time)

River Song noted a theory that the SporeShips were leftover weapons from the war that wiped out the previous universe. (AUDIO: Signs)

Because the universe during the Dark Times was radically different in a fundamental sense from what it later became, it was sometimes confused for a totally separate universe which had preceded the Big Bang. The Sixth Doctor learned about "the universe before [his own] was created" from the Matrix during his time as Lord President, and he described it to Anne Travers as "a totally different universe, with alien physical laws. The heavens were green, and the stars looked like... giant doughnuts, to be brutally frank. Very, very different. And, as in this universe, there were people who discovered the deeper mysteries of time and space". (PROSE: Millennial Rites) Likewise, noticing that the Ancient Lights seemed to conform to the rules of astrology despite them contradicting conventional physics, Luke Smith guessed that they originated in "the universe before this one" where astrology and magic were real. (TV: Secrets of the Stars)

The Seventh Doctor learned from the Carnival Queen that the Time Lords misinterpreted their knowledge of what had come before, and that the universe of irrationality was simply the state of reality before the Time Lords created the Web of Time (PROSE: Christmas on a Rational Planet) during the anchoring of the thread. (PROSE: The Book of the War) The Kaliyuga did not merely follow the Dvapara Yuga; it replaced it. (PROSE: Dharmayuddha)

First life-forms
After the First Proliferation, where life began, came the rise of "the Old Ones, the giants of the universe", a term used to refer to the earliest and most powerful species. (PROSE: The Knight, The Fool and The Dead)

The Hond were speculated by the Tenth Doctor to be one of the first species, as "the primordial ooze" given sentience. He suggested they had been created in constant pain as a result of "the universe not quite knowing what life was like yet." (COMIC: Defender of the Daleks) The Kamishi, also known as the First Race, were another one of the earliest known civilisations. (AUDIO: The Rulers of the Universe) The Tenth Doctor claimed the natives of Gallifrey were regarded as "the oldest and mightiest race in the universe". (TV: The Sound of Drums)

Species that flourished in the Dark Times included the Dæmons, Eternals, the Gods of Ragnarok, (PROSE: No Future) Racnoss, (TV: The Runaway Bride) Nestene, (TV: The Infinite Quest) Qwerm, Narlok, (PROSE: River of Time) Osirans, (COMIC: Old Girl) Jagaroth, and Kastrians. (PROSE: Doctor Who and the Krikkitmen) The Mandragora Helix also originated from the Dark Times. (PROSE: Beautiful Chaos)

At the "dawn of the universe", the Carrionites waged a war with the Hervoken. The Eternals were present during this time period, banishing both the Carrionites and the Hervoken to the Deep Darkness, although some of them escaped. (PROSE: Forever Autumn) During the Dark Times, there was a race known as the Hyffons, whose race became engulfed in a war on their home world. A Sontaran was apparently present at one battle in the war.

Hoping to put an end to the conflict, the race invented the Continuity Cap, a device which would allow the wearer to change events from their own personal history. Using this, the Hyffon's were able to change their planet's political history until the war no longer existed. However, the Cap fell into the wrong hands, and eventually, the planet's history was changed so much that the Hyffons "vanished in a puff of [their] own continuity." (COMIC: The Continuity Cap)

The Great Old Ones were present in the universe at this time. It was during this time period, too, that the legendary spaceship Infinite was created. (TV: The Infinite Quest)

The elder books of the Dark Times, created by elder powers such as the Dæmons, Eternals, and the Gods of Ragnarok, had details on how to capture and harness a Chronovore. Part of the necessary ritual, according to the books, involved spheres from the Sisterhood of Karn and a pentancle drawn in the blood of five species who "had their genetic destinies changed by the Capitol": Minyans, Silurians, Daleks, Humans, and Mandrels. (PROSE: No Future)

Coming of the Kotturuh
It was popularly believed that among the first species in the universe were the Kotturuh, who laid low for "a millennium or two", according to River Song, and then set out to distribute mortality to the beings of the universe, (PROSE: The Guide to the Dark Times) starting on the planet Birinji. (PROSE: The Dawn of the Kotturuh)

However, the Kotturuh themselves believed they actually predated this universe and had been spreading what they saw as the "gift" of mortality in the prior universes; they expected they would do so again in subsequent universes. (PROSE: The Dawn of the Kotturuh) Inyit later claimed their beliefs were wrong. (PROSE: All Flesh is Grass) The Kotturuh drew their power from a realm accessible via their homeplanet Mordeela. (PROSE: The Knight, The Fool and The Dead) Their emergence began what was known as the Kotturuh crisis. (PROSE: The Guide to the Dark Times)

As the Kotturuh spread, various races responded in different ways. The Eternals fled, losing the ability to live their own lives in the process. The Osiran Sutekh bargained with them and gained the gift of death for himself. The Dæmons tried to fight back, resulting in them eventually being driven to extinction. (PROSE: The Guide to the Dark Times) After being banished to the Dark Times by the Time Lords following the mayhem he had caused during the Doctor's trial (TV: The Ultimate Foe, AUDIO: Lesser Evils) witnessed a Kotturuh woman at work on the planet Alexis and attempted to influence her decision. (AUDIO: Lesser Evils)

Earth during the Dark Times
During the times before the anchoring, Earth was home to cities with buildings carved from mile-high arches of ivory, with streets made of cobweb and gardens tended by their stone men. (PROSE: Christmas on a Rational Planet) They were ruled by the mammoths, who in their original form were sapient beings of great power, led by Cernunnos. (PROSE: Cobweb and Ivory)

Many humans had semi-divine powers: for instance, Arjuna had one thousand arms and was ardently skilled at compressing time, while Nakula and Sahadeva led armies of imaginary hybrid animals made of broken time. The Great Houses' plan for ending the Dvapara Yuga involved starting the Kurukshetra war between the Pandavas and Kauravas. (PROSE: Dharmayuddha)

The Guardian of Might, Guardian of Magic and Champion of Neutrality were said to have existed in "the universe before and after this one" by one Time Lord account of their games. The two Guardians chose the mythical Earth as the battlefield of the games of their "proxies", King Arthur and Morgaine. (PROSE: Legends of Camelot)

Gallifrey during the Dark Times
In the Dark Times, (COMIC: The Wishing Well Witch) Gallifreyans evolved under the influence of the Untempered Schism. (COMIC: Old Girl) The Tenth Doctor once encountered an amalgam of young Gallifreyans who had been thrown into the Schism during the Dark Times. (COMIC: The Wishing Well Witch) He and Cindy Wu later visited this era of Gallifrey, which was billions of years before the Doctor's native era and "before Rassilon and his Black Scrolls, before time travel was even invented". (COMIC: Old Girl)

Gallifreyans examining their own future wrote the Green Book of Gallifrey and the Black Book of Gallifrey, which foretold the Timewyrm devouring Rassilon at the end of the universe (PROSE: Timewyrm: Revelation) and the Event. (PROSE: The Ancestor Cell) Another Gallifreyan prophecy from the Dark Times said that a Vampire would survive on "a world that will be called Ravolox". (PROSE: Goth Opera)

According to one account, the First Tecteun was one of the first explorers to leave Gallifrey. (TV: The Timeless Children)

Under the rule of the Pythias, a line of female seers, Gallifrey built an interstellar empire. (PROSE: Cat's Cradle: Time’s Crucible)

The Kotturuh visited Gallifrey and, aware of the eventual rise of the Time Lords, judged its people as having much to offer. (PROSE: The Knight, The Fool and The Dead) They imposed death, which the Gallifreyans called "the Ultimate". (COMIC: Monstrous Beauty)

Time Scoops were created in the Dark Times. (PROSE: The Eight Doctors, World Game)

The Eternal War begins
The people of Gallifrey caused the release of the Great Vampires into N-Space, (AUDIO: Project Twilight) which some accounts atttibuted to Rassilon's early experiments with black holes, (PROSE: The Pit, Interference: The Hour of the Geek) whilst another account suggested their release came about as part of the anchoring of the thread. (PROSE: The Book of the War)

An old hermit taught the Doctor that the Great Vampires had come from nowhere and "swarmed and swarmed", with a single vampire being able to suck the life out of an entire planet. (TV: State of Decay) River Song believed the Vampires were forced to adopt a lifestyle of feeding on mortal beings as part of a deal with the Kotturuh to keep their immortality. (PROSE: The Guide to the Dark Times) Lord Tepesh argued that the Vampires had been content to live in peace, however Rassilon's xenophobia led to Gallifrey waging war on them. (AUDIO: Zagreus)

At any rate, the Eternal War began between Gallifrey and the Great Vampires, with Gallifreyan commanders leading the fight including Kopyion Liall a Mahajetsu (PROSE: The Pit) and Rassilon. According to one account, at this time the Gallifreyans were known as the Space Lords. (COMIC: Monstrous Beauty)

The Kotturuh crisis escalates
The Tenth Doctor travelled back into the Dark Times via the time fracture, arriving on the planet Andalia. He witnessed a demonstration of Professor Hana Fallomax's lifeshroud technology on Estinee, which was disrupted by the intervention of Brian, who was contracted to test the technology's efficacy. The Kotturuh arrived on Andalia and judged the natives, to the Doctor's horror, and took Estinee with them back to Mordeela. The Doctor and Brian followed them and witnessed Estinee being rescued by Fallomax. Learning Fallomax was developing the lifeshrouds to resist the Kotturuh, the Doctor decided to help. He spent days working in vain on the lifeshrouds, discovering they only appeared to work in demonstrations because of Estinee's natural immunity to the Kotturuh, only succeeding in making the Mordeela crystals they depended on last a couple of hours longer. The Doctor realised he had a physical sample from a Kotturuh who had made physical contact with him and used that, and data collected from Andalia, to reverse-engineer their power as necrotic virus to inflict a lifespan on them. Brian took control of mercenary forces as he worked, believing the Doctor was effectively going to war with the Kotturuh. The Kotturuh confronted the Doctor on Andalia, attempting to force Estinee into killing him until she chose to take her own life to stop them. Infuriated, the Doctor unleashed his virus on them and sentenced them to a lifespan of fifteen minutes. (PROSE: The Knight, The Fool and The Dead)

The Doctor's actions in the Dark Times caused fluctuations in time, (PROSE: The Guide to the Dark Times) rewriting the timelines of entire planets in the future including Atharna and Wrax (AUDIO: He Kills Me, He Kills Me Not, The Enemy of My Enemy) and rewriting the Dalek Restoration Empire so they never fought the Last Great Time War. (COMIC: Defender of the Daleks) Investigating the temporal anomalies in the future led to the Eighth Doctor and a Dalek Time Squad travelling back to the Dark Times to find the source. (AUDIO: The Enemy of My Enemy) At the same time, the Ninth Doctor and Rose Tyler arrived in the midst of the Eternal War. After helping Vampire slaves liberate themselves from the Three Mad Sisters, the Doctor stayed with them aboard their coffin ship whilst Rose stayed on a moon to recover from briefly becoming a Vampire. (COMIC: Monstrous Beauty) The Time Squad's investigation into the source of the alterations and the Ninth Doctor feeling something was wrong with the Dark Times led both factions to Mordeela. (PROSE: All Flesh is Grass)

As the Kotturuh died, the Doctor led the mercenary forces to Mordeela, intending to seal off the Kotturuh's power source. His fleet was confronted by the arrival of a Dalek saucer, carrying the Eighth Doctor, and the coffin ship, commanded by the Ninth Doctor. Both of them pleaded with him to stop, but he dismissed them as tricks and ordered his fleet to open fire, (PROSE: The Knight, The Fool and The Dead) destroying Mordeela. Whilst the younger Doctors were shocked, the Daleks and Vampires attacked, beginning the Battle of Mordeela. Despite the Doctors' efforts to rein their forces, the Battle escalated and resulted in the destruction of the Tenth Doctor's forces, save his flagship. The Tenth Doctor managed to use the ruins of Mordeela to seal the gateway to the Kotturuh power source as intended, using that to mask his ship's escape. (PROSE: All Flesh is Grass)

The Tenth Doctor continued wandering the Dark Times in the surviving mercenary ship, connecting his TARDIS to its damaged engines, accompanied by Brian. (AUDIO: The Minds of Magnox) The Tenth Doctor went to a desert planet alone and was feasted by ghosts, who fooled him into believing he had saved a species. He was found by Brian, who revealed the truth and destroyed the ghosts. (COMIC: Tales of the Dark Times) The Doctor took their ship to Magnox, where he sought to ask the Council of Minds if he had done the right thing taking on the Kotturuh, whilst Brian was embroiled in a plot to assassinate the Minds. A Kotturuh ship led by Avkhan arrived, demanding the Minds tell them how to survive the Doctor's judgement or they would wipe out the planet. Brian assassinated the Minds before he could met them, forcing the Doctor to organise a hasty evacuation of Magnox before the Kotturuh reduced it to ruins. The survivors of Magnox settled on Islos. (AUDIO: The Minds of Magnox)

The Dalek Time Squad, believing they had failed to correct history, began a back-up plan of harvesting lifeforms unique to the Dark Times to weaponise them. (PROSE: Mission to the Known) The Squad harvested the population of Velosia under the pretense of saving their best minds from the coming of the Kotturuh. (COMIC: Tales of the Dark Times) The Eighth Doctor found himself excluded from the Daleks’ schemes, as they only needed him to ensure their eventual departure from the Dark Times, but was allowed to join their explorations, (PROSE: All Flesh is Grass) including of an abandoned spaceship they discovered. The Doctor realised it had been left by a species wiped out by the Kotturuh as a reminder of their civilisation. The Daleks found a source of Huon energy aboard and attempted to absorb it, requiring assistance by the Doctor when it went wrong. (COMIC: Tales of the Dark Times)

The Ninth Doctor continued to help the Free Undead search for a planet to settle on, (PROSE: All Flesh is Grass) visiting Parvanna with Ikalla, where they were hunted by an invisible creature, which the Doctor held off by setting a sonic stake alight. (COMIC: Tales of the Dark Times) His coffin ship was targeted by the Daleks, seeking a Vampire for their experiments, but the Eighth Doctor forewarned the Vampires so they could evacuate and escaped with the Ninth Doctor in his TARDIS. (PROSE: All Flesh is Grass) After the Eighth Doctor left the Daleks, the Time Commander and Executioner received pre-recorded orders from the Emperor, ordering them to target Gallifrey to avert the creation of the Time Lords. (PROSE: Mission to the Known) Meanwhile, the Strategist and Scientist continued the experiments, seeking to create a more biologically efficient form of Dalek - the Symbiont. (PROSE: All Flesh is Grass)

Together, the Eighth and Ninth Doctors went in search of the Tenth Doctor, travelling to the planet Hoolan. They discovered a malfunctioning time machine bridging the future to the Dark Times, after its pilot had attempted to witness the Big Bang. They fixed her time machine and sent her back to her home time period. (COMIC: Tales of the Dark Times) The two Doctors eventually tracked their tenth incarnation to Entranxis, where he was meeting the Death Brokers to procure new weapons for his ship. They rescued Ikalla, who had been captured after the evacuation, from the Brokers, but the Daleks attacked, seeking to capture her. The Ninth Doctor escaped with her back to his TARDIS whilst the other two Doctors returned to the Tenth Doctor's ship. They reunited in orbit, but the Ninth Doctor was angered by his other selves' lack of concern for the dying Kotturuh and left with Ikalla to help them. Their target lost, the Daleks wiped out Entranxis by setting its atmosphere alight, horrifying the Eighth and Tenth Doctors, who resolved to stop them.

The Ninth Doctor and Ikalla's search led to them Birinji, where they met Inyit, now the last of the Kotturuh. Meanwhile, the Eighth and Tenth Doctors discovered a coffin ship the Daleks had attacked and convinced a surviving Bloodsman to help them and Brian infiltrate the Dalek saucer. There, the Tenth Doctor witnessed the creation of the Symbiont using Great Vampire DNA and the Eighth learned the Daleks had been killing off the Kotturuh, including dispatching a scout ship to Birinji, in preparation for attacking the "Ultimate End". A power drain caused by the experiments enabled them to escape, leaving Brian behind, and they had their ship destroy the scout ship attacking Birinji, where they reunited with the Ninth Doctor. Brian contacted them to reveal he had hidden in the saucer's engine room, having attached himself to an explosive to protect himself from the Daleks, and that their destination was Gallifrey. The Doctors went to mount a defence of their homeworld, leaving Ikalla to look after Inyit, with the Tenth Doctor rescuing Brian on the way. His rescue caused the Strategist to realise the Doctors knew their plan, so it had the Drones enhanced with Symbiont DNA to counter their defences. Whilst the army of undead Daleks battled the Doctors' ship and the three coffin ships who'd answered Ikalla's summons, the original Symbiont was sent to kill Inyit. She issued the final judgement on it, wiping out it and all the Drones sharing its DNA. This threw the Daleks' assault into chaos, as they panicked that the judgement may spread to pure Dalek DNA, enabling the Eighth Doctor to board the saucer and trigger Brian's explosive, forcing the ship into the Time Vortex and out of the Dark Times.

The Ninth and Tenth Doctors returned to Birinji, where they witnessed Inyit's death. The Tenth Doctor finally conceded he had gone too far and reconciled with his ninth incarnation, agreeing to end his rewriting of history. As the free Vampires settled on Birinji, Brian decided to stay with them and the Tenth Doctor departed the Dark Times. (PROSE: All Flesh is Grass) The Ninth Doctor returned to Rose and, when she recovered, likewise left the Dark Times. (COMIC: Monstrous Beauty)

Thirty years after the end of the Kotturuh crisis, the Eleventh Doctor visited the ruins of Magnox and recovered a data drive. He took it to Islos, where the survivors had started a new archive of knowledge. (AUDIO: The Minds of Magnox)

End of the Dark Times
The Dark Times were followed by the Old Time. (PROSE: A Brief History of Time Lords) All of the monstrous species of the Dark Times eventually died out. (PROSE: Doctor Who and the Krikkitmen)

Rise of the Time Lords
The Dark Times ended with Rassilon's overthrow of the Pythia and the foundation of Time Lord civilisation on Gallifrey. (PROSE: Cat's Cradle: Time's Crucible, A Brief History of Time Lords) The three main founders of the Time Lords were Rassilon, (TV: The Deadly Assassin) Omega, (TV: The Three Doctors) and an other. (PROSE: Remembrance of the Daleks) According to one account, Tecteun was a founder after she cracked the Timeless Child's genetic code and regenerated herself. In a new incarnation, Tecteun proposed sharing this gift among the new rulers of Gallifrey. (TV: The Timeless Children)

The Time Lords continued time travel experiments. Omega became the first Gallifreyan to enter the Time Vortex, (PROSE: The Evil and the Deep Black Sky) and developed a stellar manipulator, the Hand of Omega. (TV: Remembrance of the Daleks) Omega and Rassilon together planned to turn a star, Qqaba, supernova to provide power for time travel. The experiment succeeded, however Omega was lost due to the interference of a Black Sun agent, Fenris, (COMIC: Star Death) or possibly sabotage by his assistant, Vandekirian. (AUDIO: Omega) Omega was remembered as a hero, though unknown to the Time Lords he had actually survived and was trapped in an antimatter universe. (TV: The Three Doctors)

Rassilon decided to make the universe rational, (PROSE: So Vile a Sin) resulting in the anchoring of the thread, (PROSE: The Book of the War) the creation of the Web of Time, (AUDIO: Neverland) which was implemented through the Temple of Atropos and the Mouri on the artificial planet Time. (TV: War of the Sontarans, Once, Upon Time) Rassilon brought the singularity of a black hole to Gallifrey, creating the Eye of Harmony which provided power to Gallifrey, (TV: The Deadly Assassin) and acted as a hitching point for the Web of Time. (AUDIO: Neverland)

Rassilon oversaw the development of TARDISes. (COMIC: The Lost Dimension) The Archons claimed TARDISes were grown from seeds they had created, which the Time Lords stole after they declared war on the Archons, wiping them out save for seven survivors. (PROSE: The Nameless City) After a failed test flight of a Type 1 by Theta Sigma, (COMIC: The Lost Dimension) the first successful flight of a Prototype TARDIS took place on the planet Henlen. (AUDIO: Collision Course)

Iris Wildthyme knew that the Lord Temporal of the Clockworks originated from the previous universe but had crossed the rapids between cosmoses to tend their Tale Without Meaning to the exclusion of everything else. Their Wordships each began as single sounds carried over from the pre-universe, amplified and refined, until it became alive and was added to the Tale. (PROSE: First Meetings)

To survive in the new universe, some supernatural entities survived by rooting themselves in fantasy and faith, becoming gods of different planets. In the Sol system, Gaia aligned with Earth, Ares with Mars, Aphrodite with Venus, Pan with El Mundo, and Hestia with Planet 5. (PROSE: The Rise and Fall of Señor 105)

The Founding Conflict saw the Ravagers attempt to overturn what the Time Lords had wrought on planet Time, banishing the six Mouri from the Temple of Atropos. The Division sent the Fugitive Doctor to capture them in a battle that became known as the Siege of Atropos, bringing an end to the Founding Conflict and restoring the Mouri. According to this account, it was this event that ended the Dark Times and saw the final actions of the anchoring of the thread, establishing linear time. (TV: Once, Upon Time)

End of the Eternal War
Twelve War TARDISes were created by the Time Lords to fight the Vampires, (PROSE: Doctor Who and the Krikkitmen) and the Patrex Chapter developed N-Forms. (PROSE: Damaged Goods)

After General Skellis designed the bowship which was capable of piercing Great Vampires, the Eternal War ended in the deaths of all the Great Vampires, save the King, (PROSE: The Multi-Faceted War) who escaped into E-Space. (TV: State of Decay) Rassilon took the credit for Skellis' designs and spent many years searching in vain for the King. (PROSE: The Multi-Faceted War) He eventually wrote the Record of Rassilon, outlining the history of the war and instructing any future Time Lord to kill the King should they ever find it. (TV: State of Decay)

In aftermath of the war, Kopyion Liall a Mahajetsu returned to Gallifrey and found religion had fallen from favour and Rassilon had risen to power. He left to guard the final opening to the Yssgaroth's universe. (PROSE: The Pit)

Extinctions of Dark Times powers
The Racnoss were wiped out by the Time Lords' Fledgling Empires in the Racnoss Wars, which the Fifth Doctor characterised as "a long and bloody affair". (AUDIO: Empire of the Racnoss) Two Webstars were known to have survived with their occupants in hibernation: those of the Empress and her children. The children's Webstar arrived in the Sol system and became the first rock in the formation of Earth. (TV: The Runaway Bride)

The Jagaroth were among the last of this era's species to survive, but eventually they too went extinct when Scaroth hunted down Racnoss energy signals to Earth. (PROSE: City of Death)

A herd of War TARDISes once suggested to Compassion that one monstrous force survived: the Rassilon Imprimatur. From the TARDISes' perspective, the Imprimatur lived in the blood of the Time Lords and controlled them, "dancing to the old agenda of the Dark Times." (PROSE: The Taking of Planet 5)

During the creation of the Hand of Omega, Omega's body was muscular and wide-shouldered, leading some Gallifreyan it differed from the regenerative norm because it was a "genetic memory" from the Dark Time. (PROSE: Remembrance of the Daleks)

Artefacts of the Dark Times
The Black Scrolls of Rassilon were relics of the Dark Times. (PROSE: The Five Doctors, Divided Loyalties)

The Valeyard claimed that the Doctor's Black Scrolls contained knowledge from the Dark Times that the Doctor used to extend their life and create the Valeyard. (AUDIO: Trial of the Valeyard)

According to legend, the Great Houses themselves preserved a small sliver of irrational reality, the 2nd Second, so that they could reverse the anchoring if it did not go as planned. (PROSE: Weapons Grade Snake Oil) Indeed, a fragment of a pre-anchoring Earth city survived in an alter-time realm. (PROSE: Cobweb and Ivory)

Travel to the Dark Times
During the Fifth Doctor's presidency over Gallifrey, a young Time Lord named Scandrius stole a TARDIS and accidentally sent it hurdling backwards in history, beyond even the Dark Time, where it created a paradox threatening the existence of Gallifrey. (AUDIO: Time in Office)

The Timewyrm once tried to return to the Dark Times to see the composition of the Green and Black books of Gallifrey, but was blocked by "fierce security and powerful temporal baffles". (PROSE: Timewyrm: Revelation)

mentioned to Ace that the Dark Times were "where none can visit". (PROSE: No Future)

Ruath once attempted to force the Fifth Doctor to pilot his TARDIS to the Dark Times to meet Rassilon and save the Great Vampires, but the Doctor thought that was impossible. (PROSE: Goth Opera)

Brian the Ood ended up in the Dark Times (PROSE: The Knight, The Fool and The Dead) after falling into the Time Vortex whilst trying to board the Eighth Doctor's TARDIS (AUDIO: He Kills Me, He Kills Me Not) and being given "a little nudge" by the Tenth Doctor's TARDIS. (PROSE: What the TARDIS thought of "Time Lord Victorious")

The Daleks were unable to penetrate the barrier around the Dark Times. (PROSE: Mission to the Known) However, the Eighth Doctor allowed the Dalek Time Squad to travel back to the Dark Times by linking his TARDIS to the Dalek timeship's engines. (AUDIO: The Enemy of My Enemy)

A woman attempted to use a time machine to witness the Big Bang, but hit the temporal barriers protecting the Dark Times. This resulted in her time machine becoming stuck on the planet Hoolan, now bridging between her present and the Dark Times. This catastrophe was resolved by Eighth and Ninth Doctors. (COMIC: Tales of the Dark Times)

When the Tenth Doctor and Cindy Wu visited Dark Times Gallifrey, the Doctor speculated that the time lock did not apply to pre-Time Lord Gallifrey. (COMIC: Old Girl) The Tenth Doctor would later access the Dark Times again via a Time Fracture. (PROSE: The Knight, The Fool and The Dead, What the TARDIS thought of "Time Lord Victorious")

The Thirteenth Doctor was able to relive events from the Dark Times through her own personal time stream, during the Great Disruption on Time, when "time went wild". (TV: Once, Upon Time)

Resurgence of Dark Times powers
According to some accounts, the War in Heaven was a consequence of the resurgence of Cernunnos, leader of the original Mammoths, who wished to reverse the anchoring of the thread. (PROSE: Cobweb and Ivory)

According to Jack Harkness, the Syriath had been trapped within the Rift since before time. (AUDIO: The House of the Dead)

The two Ravagers were unleashed to act as a poison to time, whilst the Flux affected space, as part of a plan to destroy the universe, (TV: Once, Upon Time) enacted by the Division. (TV: Survivors of the Flux)