Races in Revelation Space

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These are fictional alien races found in Revelation Space series of stories and novels.

Contents 1 Hamadryad 2 Inhibitors / Wolves 3 Pattern Jugglers 4 Shrouders 5 Nestbuilders 6 Scuttlers 7 Shadows 8 Grubs

[edit] Hamadryad

The hamadryad is a fictional alien species, native to the Santiago peninsula on the planet of Sky's Edge in Alastair Reynolds's Revelation Space hard science fiction space opera novels. Most information about them is imparted in the novel Chasm City, where much of the action takes place on Sky's Edge. Hamadryads are named for the hamadryads of Greek mythology, for reasons which become obvious with an understanding of the animal's life cycle.

As the climate of Sky's Edge suffers no winter season, there was no ecological niche into which creatures analogous to mammals could evolve. Similarly, the vertebral column never evolved there, so all fauna are invertebrate poikilotherms, with the largest being broadly analogous to reptiles on Earth. Whilst the largest invertebrates on Earth are aquatic, such as squid, large invertebrates Sky's Edge also populate the land, possibly as the result of a catastrophic event having caused the oceans to shrink. The hamadryad is the largest land-based lifeform native to the planet.

The lack of a spine is handled, by evolution by animals maintaining structural rigidity "through the pressure of circulatory fluids alone, pumped by hundreds of hearts spread throughout the creature's volume".

The life cycle of the hamadryad is rather complex: juvenile and near-adult hamadryads are snake-like limbless creatures, of minimal intelligence, with a very simple central nervous system. The juvenile owned by Cahuella is described as being 12 metres in length and roughly as thick as an adult human's torso for most of that length, weighing more than a tonne. Being limbless, the creatures move like snakes on Earth. Their cold-bloodedness means that they generally move slowly, feeding infrequently, and are remarkably long-lived, with a longevity of hundreds of years. Being the largest native land-based lifeforms, the hamadryad has no real predators.

Juvenile and near-adult hamadryads have no external eyes but, despite this, are capable of camouflaging themselves to match their surroundings. The hamadryad does have eyes, however, with remarkably visual acuity, set inside the upper roof of the jaw, spaced apart for binocular vision. Whilst hunting and preparing to ambush, prey are triangulated with a host of other senses, such as infrared vision and smell.

At the end of the near-adult phase, adult hamadryads bond with a hamadryad tree, their bodies becoming part of the bark. The first explorers on Sky's Edge didn't investigate the hamadryad trees very well before the planetary war began, so the nature of the creatures' life cycle was not immediately apparent. The trees are relatively rare, but distributed across a large part of the Santiago peninsula, rising to a height of 40–50 metres above the forest floor. They are broadly cylindrical in shape, thickening towards the base, with an almost metallic-looking helical structure wrapped around the length of the trunk and a wide canopy at the top, tens of metres in diameter.

The first scientists to investigate these trees discovered unusual cell differentiation both radially and around the tree's perimeter — animal epithelial cells towards the outside, with soft, lipid membranes, and plant cells further inwards, with cellulose-like cell walls and chloroplasts.

[edit] Inhibitors / Wolves

The Inhibitors are Alastair Reynolds's answer to the Fermi Paradox in the Revelation Space novels.

The Inhibitors are the intelligence left over from a massive war — the Dawn War — that occurred between the first few civilizations that arose in the Milky Way galaxy. It is hinted in the books that they were once organic but that they later discarded their organic forms and became wholly machine. Apparently, the hints of a quadrupedal, warm-blooded vertebrate (also known as mammalian) past can be faintly discerned in their architectures.

They are nonsentient (some would argue postintelligent) machinery functioning on unknown principles (possibly femtotechnology or "structured" spacetime) and capable of self-replication. They were created by the survivors of the Dawn War and their task is to inhibit the spread of intelligent life to individual planets or solar systems: the purpose, stated in Redemption Ark, being to shepherd the galaxy through a crisis 3 billion years (or 13 Galactic Turns) in the future: the collision of the Milky Way with the Andromeda Galaxy. By confining sentient life to only a few planets, they make the process of moving stars and systems (for collision avoidance during the crisis) far easier and more centralized, thus preserving life. However, when they have no choice, they tend to commit acts of xenocide in order to prevent life from spreading further.

They are, as mentioned, not sentient; however, in order to supervise and control the process of xenocide, they are capable of forming a sentient overseer from many less-than-sentient machines. They also have some very interesting and advanced technology, and apparently know about fifteen ways to kill a star, including one that allows the core material of a star to gush out and be used as a sort of solar flamethrower on planets (shown in Redemption Ark). This is the exception rather than the rule however, as being forced to destroy an entire system to cull a single species is viewed as a moral defeat. Normally it is much preferred to exercise (relative) restraint and preserve the long-term ability of the affected worlds to support life.

They do not actively monitor the galaxy in their wait for a new starfaring culture to suppress, instead they plant a series of triggers near interesting phenomena or structures in the galaxy and wait for sentient life to activate those triggers. The Cerberus object around the "neutron star" Hades was one such object, and it was inadvertently activated by Dan Sylveste at the end of the book Revelation Space, thus triggering the events in the rest of the series. Another such object is the subject of Reynolds' novella, Diamond Dogs (although the nature of said object is only revealed in Turquoise Days).

They are called wolves by the Conjoiners, because they lurk in the blackness of interstellar space and attack in packs.

In the novels it becomes apparent that the Inhibitors are starting to fail in their mission as civilisations are getting further and further into space before being found and destroyed. In fact, in the last book (Absolution Gap), in the epilogue, it is shown that humanity, with technological assistance from other starfaring, albeit hidden, cultures (for example, the Nestbuilders), were able to push back the Inhibitors and establish a space that was Inhibitor-free. However, this introduced the problem of Greenfly, a terraforming-replicator gone wrong that ravaged systems.

[edit] Pattern Jugglers

Pattern Juggler is the name given to a science-fiction entity in the "Revelation Space" novel series by Alastair Reynolds. In the series (circa 2500), humanity has spread across the stars and encountered numerous inexplicably fallen alien civilizations. Only one living alien life form has been discovered: the Pattern Jugglers. The Jugglers are collectives of marine organisms that inhabit widely scattered water-covered planets. Whether or not they exhibit consciousness is up for debate, but in either case they are certainly advanced, capable of spontaneously gathering large rafts of complex organic systems and producing structures as advanced as superconductive strands. Human swimmers in Pattern Juggler seas appear to be infiltrated by the alien organisms(s), often resulting in out of body experiences and giving the swimmers short-lived periods of heightened consciousness and mental clarity. Some swimmers also report feelings that they encountered the memories or minds of other past swimmers during their immersion. Repeat swimmers, however, face the risk of the sea taking too much of a liking to them, in which case they never return to land. Reynolds' novella Turquoise Days goes into more detail about the Pattern Jugglers.

[edit] Shrouders

Shrouders are the inhabitants of a portion of space where gravity is so tightly warped that the inhabitants are, effectively, sealed off from the rest of the universe. The Shrouders began as a race of bird-like creatures (the Amarantin) on the planet Resurgam. One group of Amarantin, the Banished, achieved space flight and inadvertently triggered one of the Inhibitors' devices for detecting intelligent, space-faring life. Unable to escape the Inhibitors, the Banished created the Shroud and retreated into it to hide until the Inhibitors (already declining in ability) were no longer active.

Other members of the Revelation Space universe are unaware of the real nature of the Shrouders. In order to determine if Inhibitors were still active and that it was safe to leave the Shroud, one group of the Banished embedded a series of false messages into the Shroud that suggested that the Shrouders were a species that had gathered treasures and hidden them inside the Shroud. Lured by these messages, anyone who penetrated further into the Shroud would have semi-sentient programs and directives embedded by the Banishers that would cause the intruders to trigger the Inhibitor device near the Banished home planet. If the Inhibitors responded to the triggering device then the Banished would know that the Inhibitors were still functioning. A second, dissenting group within the Banished planted a separate set of programs and directives to prevent the first group's plan from succeeding believing that triggering the Inhibitors could lead to the discovery of the Banished hidden in the Shroud.

[edit] Nestbuilders

The Nestbuilders, or conch-makers as they were first known as, are a race of alien beings who have lived in hiding from the Inhibitors. They were responsible for the death of the scuttlers, who made the mistake of trying to contact the shadows. With the help of the Nestbuilders, humanity was able to overcome and push back the Inhibitors, and create a large area of Inhibitor-free space. It is not explained what they look like or what they are.

[edit] Scuttlers

The scuttlers were the race that first inhabited Hela. After being pushed back by the Inhibitors, the scuttlers tried to contact the shadows for assistance by using a gravity device to send a message between braneworlds. This was a mistake, and the scuttlers were wiped out by the Nestbuilders.

[edit] Shadows

The Shadows are a race of sentient beings who exist on a parallel braneworld. In their original universe, they were pursued by a relentless terraforming agent which ripped apart their worlds and remade them into millions of asteroid sized habitats. In order to escape from the agent which had overrun their brane, the Shadows abandoned their original physical forms and jumped into a different brane. In Absolution Gap, the emissary of the shadows is trapped in the scrimshaw suit which is held by Quaiche. At first, Rashmika thinks it is right to negotiate with the shadows, but Scorpio suggests that the scuttlers were wiped out for trying to make contact with the Shadows, and the humans do not. There is some suggestion that the terraforming agent which the Shadows are fleeing from is the Greenfly.

[edit] Grubs

The grubs are a race of grub like organisms which survived after the Inhibitors wiped out most sentient life in the galaxy. They were masters of camouflage. In a flashback in Chasm City, Sky Haussmen destroys one of the last remaining grub ships. A grub is alive also in Chasm City (both the book and the place itself), until it presumably dies either from exhaustion or is killed by Mr. H's emissaries. The grubs created the inertia suppressing machinery which helped the humans in the long run, and helped with the evacuation of Resurgam.