45 characters, locations, and items in this world codex.

Characters

Bill Hines — The Wallfacer who weaponized despair — a neuroscientist who imprinted defeatism into the human mind and lived long enough to regret it.
Cao Bin — Bunker Era physicist who guides Cheng Xin through the abandoned ghost-city of Lightspeed II — the failed black-domain laboratory that almost saved the
Cheng Xin — The aerospace engineer turned Swordholder whose merciful instinct will doom four billion people, and whose forgiving instinct will outlive the univers
Chu Yan — Captain of Blue Space — the man who saved his ship from the Battle of Darkness by trusting his crew to vacuum, and broadcast Trisolaris's coordinates
Dongfang Yanxu — Captain of Natural Selection, relieved of command for nothing, killed by an ally for math — a casualty of the Battle of Darkness.
Fraisse — Aboriginal elder, hibernated for his cultural knowledge, who took in AA and Cheng Xin during the resettlement and never blamed anyone for anything.
Guan Yifan — Cosmologist of the Blue Space, two centuries lost in the dark forest, who becomes the man who waits with Cheng Xin at the end of the universe.
Luo Ji — The first Swordholder. Held the dark-forest deterrence over two civilizations for fifty-four years and is now a centenarian forced to hand the switch
Princeps — The Trisolaran head of state — the voice that ordered the relocation of humanity and, soon after, watched its own world die.
Singer — A worker-poet of an unknown high-civilization listening post — the operator who decides our system is worth a slip of paper, and fires it.
Sophon — The Trisolarans' android voice on Earth — a slim Japanese-styled woman in a tea-house kimono whose smile becomes a soldier's sneer the second the Swor
Thomas Wade — The PIA director who would have pressed every button. Lost the Swordholder vote to Cheng Xin, lost his hand trying to murder her, and ultimately built
Yun Tianming — The terminally ill engineer who loved Cheng Xin in silence, gave her a star for a present, then was launched as a frozen brain toward the enemy fleet
艾 AA — Astronomer, businesswoman, and the friend Cheng Xin needs at every turn — the practical, ferocious, soap-paper-boat genius who actually makes things w

Locations

4D Space Pocket — A surviving fragment of four-dimensional space drifting through 3D — where Blue Space and Gravity defeat the droplets and meet a sentient tomb.
Australia — The continent on which the Trisolarans corral 4.5 billion humans without infrastructure, food, or law — the reservation where humanity is meant to eat
Blue Space — The 1,500-meter Stellar-class warship that fled the Doomsday Battle, broadcast Trisolaris's coordinates, and became the seed of a starfaring human cul
Bunker World — Humanity's last home: a constellation of giant orbital habitats in the shadow of Jupiter and Saturn, sheltering behind the gas giants from a strike no
Deterrence Center — A circular concrete vault three hundred meters under the steppe outside Hohhot — one chair, one switch, one person responsible for two civilizations.
Earth — The third planet — by Death's End, abandoned, then resettled, then evacuated to Bunker World, then folded flat by the dual-vector foil.
Earth Civilization Museum — The vault on Pluto where Luo Ji and AA store humanity's last art and writing, hoping a future hunter will see something worth not killing.
Halo City — The space-city headquarters of Halo Group — Cheng Xin's corporate empire and Wade's secret lightspeed shipyard on the rim of the Bunker World.
Jupiter — The gas giant in whose long shadow humanity hides the Bunker World — and the planet whose flattening is the warning the dual-vector foil has reached t
Lightspeed II — The abandoned ghost-station at the Sun-Jupiter L2 point, built around a microscopic black hole that should have lowered the speed of light around the
Pluto — The dwarf world at the rim that hosts the Earth Civilization Museum — humanity's chosen monument, packed with art and writing in a desperate hope that
Pocket Universe 647 — A stable 1km-radius bubble universe outside our own — Yun Tianming's gift to Cheng Xin and Guan Yifan, where they wait out the heat death of the world
Solar System — Sol and her planets — the doomed system that is the setting of every era of Death's End and ends as a flattened oil painting.
Sophon's Tea House — Sophon's Japanese-style tea pavilion built high in a giant tree-city — the tasteful set on which she stages humanity's last polite conversations with
The 2D Solar System — What is left of our home after the dual-vector foil — every planet, every habitat, every body folded into a perfect lossless flat painting hanging in
Trisolaris — The chaotic three-sun world that hunted Earth for four hundred years — destroyed at the height of Death's End by a photoid from an unknown civilizatio

Items

Black Domain (Slow Light Safety Notice) — A dark-forest survival strategy: lower the speed of light around your home system until you become a tiny, harmless dot — the cosmic equivalent of sta
Broadcast Era (2272-2332) — The sixty years between Blue Space's broadcast and the photoid that kills Trisolaris — the era when humanity learns it has, by surviving, killed itsel
Bunker Era (2333-~2400) — Humanity's life in the gas-giant shadow — the comfortable, slow, doomed century before the dual-vector foil arrives.
Curvature Propulsion Drive — The lightspeed engine — a propulsion system that warps the structure of space itself behind a ship, leaving a black scar through the cosmos.
Deterrence Era (2208-2270) — Sixty-two years of cold-war balance under Luo Ji's finger — and the moment it ends in a tea-house with a bow.
Droplets (Strong-Interaction Probes) — Trisolaran probes — mirror-perfect quicksilver teardrops, each capable of destroying an entire human fleet, and the weapon that ends the Deterrence Er
Dual-Vector Foil — A white slip of paper the size of a credit card, fired by Singer at the Solar System — a dark-forest weapon that collapses 3D space into 2D and never
Gravitational-Wave Broadcaster — Earth's deterrence weapon — a network of buried antennae that, if fired, broadcast Trisolaris's coordinates (and unavoidably, the Sun's) to the dark f
Halo Group — Cheng Xin's commercial empire, built on her ownership of star DX3906 — and the corporate cover Thomas Wade uses to develop humanity's first lightspeed
Photoid — A near-lightspeed mass-dot — the dark-forest weapon that ends a star and the system around it. The Trisolarans receive one before humanity does.
Staircase Program Capsule — Humanity's first interstellar mission — a tiny probe driven by sequential nuclear detonations, carrying Yun Tianming's frozen brain toward the Trisola
The Great Resettlement — The Trisolaran-enforced relocation of all 4.5 billion humans to Australia in the days after deterrence collapses — the worst hour of the species.
The Ring (Tomb) — A sentient four-dimensional ship that calls itself 'Tomb,' encountered in a collapsing 4D bubble — and the universe's clearest first-person testimony
The Two-Dimensional Collapse — The end of the Solar System. The dual-vector foil unfolds and the planets fold flat from the rim inward — a death humanity watches in real time.
Yun Tianming's Three Fairy Tales — Three innocent-sounding children's stories Yun Tianming tells Cheng Xin across light-years — encoding curvature propulsion, the dual-vector foil, and

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