Kotturuh

The Kotturuh, or the "Bringers of Death", were a species from the Dark Times who could bring an end or apply a limit to the lifespan of other species. (PROSE: The Guide to the Dark Times)

Biology
The Kotturuh were immortal, with the ability to grant (or enforce) a defined lifespan upon an entire species - from thousands of years to instant destruction. They typically wore robes which concealed their tentacled lower halves. (PROSE: The Guide to the Dark Times, et al.)

The Kotturuh had purple skin. (PROSE: The Knight, The Fool and The Dead)

The Doctor once saw beneath a Kotturuh’s veil. Their face was covered in deeply-etched symbols which were bleeding and their eyes oozed rot. The sight filled him with “A primal horror”. (PROSE: The Knight, The Fool and The Dead)

Culture
The Kotturuh saw death as both their religion and their gift to other species. (PROSE: The Guide to the Dark Times) They referred to this as their "Great Task". (PROSE: The Dawn of the Kotturuh) They assigned lifespans according to how species fit in their “Design”, (PROSE: The Knight, The Fool and The Dead) which they also referred to as the “Great Song”. (PROSE: The Dawn of the Kotturuh)

When the Doctor was planning on blowing up the Ark of Whispers to prevent it from crashing into a planet, Benny mentioned the Rites of the Kotturuh as a piece that may be aboard the mythical ship. (AUDIO: Have I Told You Lately?)

Kotturuh individuals wore robes adorned with symbols each taken from a different civilisation they had judged. (AUDIO: Lesser Evils) The Tenth Doctor noted these symbols seemed to shift as he tried to take them in. (PROSE: The Knight, The Fool and The Dead)

History
The Kotturuh believed that they had been spreading the "gift" of death in the universes before N-Space and that they would continue to do so in the subsequent universes. (PROSE: The Dawn of the Kotturuh) They hailed from a realm which could be accessed via a gateway on the planet Mordeela. (PROSE: The Knight, The Fool and The Dead)

The Kotturuh were among the first species in the universe. After “a millennium or two”, they set out to distribute death among the denizens of N-Space. (PROSE: The Guide to the Dark Times) This began on the planet Birinji, where a triumvirate of Kotturuh assessed the native population as contributing little to the Great Song and accordingly assigned them a lifespan of three months. (PROSE: The Dawn of the Kotturuh) The Kotturuh kidnapped individuals from across the universe to turn them into revenants, undead forced to recite the date in the Design when their people should be judged. Numerous delegates who travelled to Mordeela to try to negotiate with the Kotturuh were also used for this purpose. (PROSE: The Knight, The Fool and The Dead)

They were known to either visit worlds peacefully, before allocating lifespans to the natives of that world, or else they would simply destroy life on a planet without so much as a word.

Many species attempted to flee from the Kotturuh, such as the Eternals, who sacrificed their ability to lead their own lives in the process, hence their reliance on Ephemerals. The Racnoss, meanwhile, went into hibernation to avoid their destruction.

Other species attempted to negotiate - the Osiran Sutekh bargained with the Kotturuh for the gift of death; the Great Vampires managed to keep their immortality on the one condition that they must feed on others to sustain their existence.

The Dæmons tried to fight back, but the Kotturuh were too powerful, leaving only Azal, who fled to Earth to live in suspended animation. (PROSE: The Guide to the Dark Times)

The natives of Eloii were made sterile and short-lived so that one of the Kotturuh's "preferred races" could one day colonise the planet. Hana Fallomax was the only survivor, having been wearing armour created by her father using crystals from a meteor he believed came from Mordeela. When charged the crystals could negate the Kotturuh’s energy wave, however frequently needed replacing. As a Professor, Fallomax dedicated herself to researching a way to make a fully working lifeshroud. (PROSE: The Knight, The Fool and The Dead)

When found himself on the planet Alexis in the Dark Times, he offered his services to a Kotturuh woman as an advisor on dispensing death, highlighting the complex intelligence of the natives despite their simple appearance, but was rejected. (AUDIO: Lesser Evils)

The Kotturuh visited the planet Destran, consigning it to death, save for Estinee who possessed an immunity to their touch. They kidnapped Estinee and brought her to Mordeela, however she was rescued by Professor Fallomax who decided to use her immunity to develop Lifeshrouds to protect against the Kotturuh. Her work became little more than a scam, as the shrouds only worked on Estinee. The Kotturuh also visited Gallifrey and, aware of the eventual rise of the Time Lords, deemed the Gallifreyans as having much to offer.

The Kotturuh came to the planet Andalia and gave its citizens a lifespan of a single lunar orbit as the Tenth Doctor was visiting, whom they quickly made an enemy out of. The Kotturuh also recaptured Estinee, who had been demonstrating Fallomax’s Lifeshrouds, prompting the Doctor and Brian followed them back to Mordeela to rescue her. Estinee was rescued again by Fallomax and the Kotturuh confronted the Doctor in his TARDIS, marking him with a date on Andalia in a few days. This only inspired the Doctor to stand against them. Though he discovered Fallomax’s Lifeshrouds were a fraud, he was able to use genetic material from the Kotturuh physically attacking him to to reverse-engineer their power as necrotic virus, returning to Andalia to analyse energies left by their judgement. He devised two solutions; one to give them a lifespan, and another to wipe them out by only allowing them to live for fifteen minutes. The Kotturuh used their influence over Estinee to have her move his TARDIS to the Doctor’s allotted date and had her kill Fallomax. They confronted him and attempted to make Estinee shoot him, however she refused and used the gun to detonate her Lifeshroud instead. The explosion caused the Doctor to glimpse beneath a Kotturuh’s veil and broke the vial holding his lesser solution. He was infuriated at their actions so unleashed his second solution, giving them a lifespan of fifteen minutes. The Kotturuh on Andalia crumbled to dust before his eyes.

The Doctor’s virus spread through the Kotturuh, resulting in numerous ships fleeing to Mordeela in the hopes of its barrier delaying their fate, and they broadcast to his mercenary fleet as it approached Mordeela, begging the Doctor for mercy. He refused and ordered his fleet to attack Mordeela to seal their realm for good. The Eighth and Ninth Doctors arrived above Mordeela aboard a Dalek saucer and coffin ship to bar their future self from going through with the final attack against them. (PROSE: The Knight, The Fool and The Dead)