Loreful
HomeDiscover
Search series, authors…⌘K
Loreful

Reading orders for SF/F series and shared universes — with your place kept in every one.

Explore

UniversesSeriesWorksAuthorsAtlas

Help

FAQAboutSite map

Account & legal

Sign inCreate accountPrivacyTerms

Data

Built on ISFDB, Wikipedia, Wikidata and Open Library. Curated reading orders carry their reasoning on the page; the rest follow publication order. Data sources & licenses

© Loreful · data: ISFDB · CC BY

More like Firebolt

anchored on:epic fantasysecondary world

but

Mood

The mood the book leaves you in.

  • The reading experience is propelled by journeys, exploration, and physical risk; excitement and forward momentum dominate over dread or introspection.
  • Joy and loss are deliberately mixed; the resolution grants characters something real while taking something else away, leaving warmth and sorrow together.
  • The book demands work from the reader — dense prose, difficult structure, unfamiliar ideas, or morally uncomfortable material — as part of its intended effect.
  • Grim events, cruelty, or despair dominate the atmosphere, and the book does not soften them with comfort or comic relief.
  • The atmosphere is quietly unsettling — wrongness, unease, and the uncanny pervade the book without necessarily escalating into overt horror.
  • The book is built to move the reader; character feeling is foregrounded and major scenes aim at a strong emotional response.
  • Humor is a primary aim and the prose plays for laughs — comic situations, wit, or dialogue produce sustained comedy, not occasional levity.
  • The book insists that things can improve; effort and decency are shown to matter, and the arc bends toward better outcomes even through hardship.
  • The book teaches as it goes — real facts, history, science, or craft are conveyed in enough depth that learning is part of the reading experience.
  • The book is designed to uplift and motivate, presenting perseverance or achievement in a way that invites the reader to aspire or act.
  • The overall register is cheerful and easygoing; stakes are kept gentle and the book avoids dwelling on pain or dread.
  • Withheld information drives the experience; the book sustains enigmas and secrets the reader wants resolved, whatever its genre.
  • The book is contemplative and inward-looking, giving more weight to thought, memory, and meaning than to external events.
  • The book works as comfort reading — low tension, a soothing pace, and an atmosphere the reader can unwind in.
  • Grief, loss, or melancholy set the dominant register, and the book lets sorrow stand rather than resolving it into comfort.
  • Sustained suspense is the point; the book keeps the reader braced for what happens next through danger, pressure, or impending revelation.
  • Playful invention and charm define the register — fanciful conceits, light absurdity, and a narration that delights in its own oddity.

About

What the story runs on.

  • Stories in which extraterrestrial beings are central — as characters, cultures, or the object of the plot.
  • Stories about venturing into space to explore — survey missions, astronauts, and the frontier of the unknown beyond Earth.
  • Stories structured as a quest — a journey undertaken to find, deliver, or destroy something of great import.
  • Stories in which staying alive against nature, catastrophe, or scarcity is the central problem.
  • Stories of lovers kept apart by law, family, faith, or station, where the obstacle to love is the plot.
  • Stories in which a friendship — its making, testing, or loss — is the emotional center.
  • Stories of growing up — a young protagonist crossing from childhood into adult knowledge and responsibility.
  • Stories about who a character truly is — self-discovery, doubled lives, and the search for a self.
  • Stories in which a buried family truth — hidden parentage, crimes, or shames — surfaces and reorders the present.
  • Stories driven by maneuvering for power — factions, conspiracies, and statecraft conducted in shadow.
  • Stories in which war itself is the subject — combat, occupation, and what warfare does to soldiers and civilians.
  • Stories organized around investigating a killing — the case, the clues, and the pursuit of the killer, in any genre's clothing.

Shelf

Where it sits in the library.

    • Fiction built on magic or other supernatural elements that have no scientific explanation.
    • Secondary-world fantasy at large scale, where the fate of nations or the world turns on the protagonists' struggle.
    • Fantasy set in a recognizably modern city or contemporary world where the supernatural intrudes on everyday life.
    • Fantasy that blends in horror's atmosphere and imagery, keeping a fantastical frame around grim or frightening material.
    • Action-driven fantasy following warriors or rogues with personal stakes against sorcerous threats, rather than world-spanning conflicts.
    • Fantasy set in a real historical period or a close analogue of one, with magic woven into the era.
    • Fantasy in which protagonists cross from the ordinary world into another world through a portal or similar passage.
    • Fiction that retells or reworks a traditional fairy tale in a new form or setting.
    • Fantasy drawing directly on myths, legends, and folklore, retelling them or building on their figures and logic.
    • Fantasy of ghosts, vampires, shapeshifters, psychics, and similar phenomena, usually set in an otherwise ordinary world.
    • Fiction mixing science-fictional trappings with overtly magical or impossible elements in one setting.
    • Low-stakes fantasy emphasizing comfort, community, and everyday pleasures over conflict and peril.
    • Speculative fiction of pervasive moral ambiguity, violence, and cynicism that rejects heroic conventions — fantasy and SF alike.
      • Fiction that extrapolates from science and technology — future societies, space travel, or speculative inventions — within at least nominally natural laws.
      • Science fiction of interstellar scope — starships, galactic polities, and adventure across star systems.
      • Science fiction committed to scientific rigor, where technical plausibility constrains the story.
      • Science fiction centered on armed forces and warfare, told largely from a military point of view.
      • Science fiction of networked, corporate-dominated near futures, pairing high technology with social decay.
      • Science fiction styled on nineteenth-century steam-powered technology, often in a Victorian or pseudo-Victorian setting.
      • Fiction depicting an oppressive or catastrophic society, presented as a warning.
      • Fiction set after civilization's collapse, following survivors in the ruins of the old world.
      • Fiction in which characters move between past and future, and the mechanics or consequences of that travel drive the plot.
      • Fiction exploring a world where a historical event went differently and history diverged from ours.
      • Science fiction about humanity's first encounter and communication with an alien intelligence.
      • Science fiction in which extraterrestrial forces attack or occupy Earth and humanity resists.
      • Fiction whose primary aim is to frighten or unsettle the reader through dread, menace, or the monstrous.
      • Horror of vast, indifferent, incomprehensible entities before which humanity is insignificant, in the Lovecraft tradition.
      • Horror of decaying houses, buried family secrets, and oppressive atmosphere in the Gothic literary tradition.
      • Horror centered on hauntings and the returning dead.
      • Horror located in the mind — paranoia, obsession, and unreliable perception rather than external monsters.
      • Horror built around the reanimated dead and survival amid their outbreaks.
      • Horror defined by explicit, transgressive gore that refuses to cut away from violence.
      • Speculative fiction of the strange and uncanny that resists both natural explanation and standard genre categories.
      • Fiction organized around solving a crime or puzzle, typically following an investigator toward the identification of a culprit.
      • A puzzle-first mystery that lays out clues so the culprit's identity can be deduced before the reveal.
      • Crime fiction of moral ambiguity, fatalism, and hard-edged style, set among the corrupt and the doomed.
      • A mystery following the realistic routines of police work — forensics, interviews, and case-building.
      • A gentle mystery with an amateur sleuth, a small community, and violence kept off the page.
      • A mystery set in a past era, where the investigation works within that period's methods and society.
      • Fast-paced fiction driven by imminent danger, pursuit, or high-stakes conspiracy, built to sustain tension.
      • A thriller of espionage — agents, tradecraft, and intelligence services in conflict.
      • A thriller centered on lawyers and the courtroom, where litigation carries the suspense.
      • A thriller driven by detailed contemporary or near-future technology, often military or scientific.
      • A thriller whose tension comes from mental states and manipulation between characters rather than external action.
      • Fiction whose central plot is a romantic relationship and its development toward an emotionally satisfying resolution.
      • Romance in which one or both partners are supernatural beings, blending fantasy elements into the love story.
      • A fantasy-romance hybrid in which the romantic arc and the fantasy plot carry equal weight.
      • Romance set in a past era, with courtship shaped by the period's society and manners.
      • Romance set in the present day, without supernatural or historical elements.
      • Fiction set in a real past period, where the historical setting materially shapes characters and events.
        • General and literary fiction emphasizing prose style, character interiority, or formal ambition over genre plot conventions.
        • Fiction in a realistic world where magical events occur and are treated as ordinary, in the tradition of Latin American literature.
        • Fiction that ridicules people, institutions, or society in order to criticize them.
        • Fiction of dreamlike, irrational imagery and logic that breaks from realistic representation.
        • Fiction that plays with narrative convention through metafiction, fragmentation, and self-reference.
        • Fiction propelled by journeys, exploration, and physical peril, where action and survival carry the plot.
        • Adventure fiction of ships and seafaring — naval engagements, voyages, and life at sea.
        • Fiction of the American frontier West — gunmen, ranchers, and lawmen, typically in the late nineteenth century.
        • Fiction centered on soldiers, campaigns, and the experience of warfare, historical or imagined.
          • Fiction written primarily to amuse, using comedic situations, wit, or parody as its organizing principle.
            • Multi-generational fiction following a family or dynasty across decades, with inheritance and kinship as the through-line.
              • Fiction whose world runs on explicit game mechanics — levels, stats, and skills that characters can see and exploit.
                • Fiction about costumed or superpowered heroes and their conflicts with comparable villains.

                Practical

                How long a commitment, whether it stands alone, and whether it has finished.

                Tap a chip to ask for it · tap again to rule it out · once more to clear. Numbers show what would be left.

                • Cover of The Hobbit
                  The Hobbit

                  series · 2 books · 1937

                  completed

                  part of Tolkien's legendarium

                  similar byadventurousdragonssecondary worldepic fantasyfantasy+1 more

                  The Hobbit (1937) is J. R. R. Tolkien's children's fantasy novel following the reluctant burglar Bilbo Baggins, who joins a company of dwarves and the wizard Gandalf on a journey to reclaim treasure guarded by the dragon Smaug. It stands as a complete adventure on its own, but shares its setting with the rest of Tolkien's legendarium and leads into the events of The Lord of the Rings.

                • Cover of Earthsea Cycle
                  Earthsea Cycle

                  series · 18 books · 1964

                  completed

                  part of Earthsea

                  similar bysecondary worldepic fantasyfantasy+2 more

                  The Earthsea Cycle, also known as Earthsea, is a series of high fantasy books written by American author Ursula K. Le Guin. Beginning with A Wizard of Earthsea (1968), The Tombs of Atuan (1970), and The Farthest Shore (1972), the series was continued in Tehanu (1990), and Tales from Earthsea and The Other Wind. In 2018, all the novels and short stories were published in a single volume, The Books of Earthsea: The Complete Illustrated Edition, with artwork by Charles Vess.

                • Cover of A Song of Ice and Fire
                  A Song of Ice and Fire

                  series · 14 books · 1996

                  part of World of Ice and Fire

                  similar byepic fantasysecondary worldfantasy+1 more

                  A Song of Ice and Fire is a series of high fantasy novels by the American author George R. R. Martin. Martin began writing the first volume, A Game of Thrones, in 1991, and published it in 1996. Martin, who originally envisioned the series as a trilogy, has released five out of seven planned volumes. The most recent entry in the series, A Dance with Dragons, was published in 2011. Since then, Martin has been working on the sixth novel, titled The Winds of Winter. A seventh novel, A Dream of Spring, is planned to follow.

                • Cover of The Lord of the Rings
                  The Lord of the Rings

                  series · 13 books · 1954

                  part of Tolkien's legendarium

                  similar byepic fantasysecondary world+2 more

                  The Lord of the Rings is an epic high fantasy novel written by the English author and scholar J. R. R. Tolkien. Set in Middle-earth, the story began as a sequel to Tolkien's 1937 children's book The Hobbit but eventually developed into a much larger work. Written in stages between 1937 and 1949, The Lord of the Rings is one of the best-selling books ever written, with over 150 million copies sold.

                • Cover of Riftwar Saga
                  Riftwar Saga

                  series · 7 books · 1982

                  part of The Riftwar Universe

                  similar byadventurousepic fantasysecondary worldfantasy+1 more

                  The Riftwar Saga is Raymond E. Feist's debut fantasy trilogy, opening with Magician, in which an orphaned apprentice named Pug is swept up when otherworldly invaders emerge through a dimensional rift into the frontier kingdom of Midkemia. Silverthorn and A Darkness at Sethanon carry the resulting war to its close, and the trilogy became the founding entry of Feist's much larger Riftwar Cycle.

                • DT
                  Dragon Trilogies

                  series · 6 books · 1988

                  similar byepic fantasydragonssecondary worldfantasy+1 more

                  The Dragon Prince and Dragon Star trilogies comprise six connected fantasy novels written by Melanie Rawn. The Dragon Prince trilogy focuses on Prince Rohan of the Desert and his Sunrunner wife, Sioned, while the Dragon Star trilogy focuses on their son, Pol. The Dragon Prince trilogy consists of novels Dragon Prince, The Star Scroll, and Sunrunner's Fire. The books in the Dragon Star trilogy are Stronghold, The Dragon Token, and Skybowl.

                • Cover of Halfblood Chronicles
                  Halfblood Chronicles

                  series · 3 books · 1991

                  similar byadventurousepic fantasydragonssecondary worldfantasy

                  The Halfblood Chronicles is a series of fantasy books originally written by Andre Norton and Mercedes Lackey. The series is set in a mystical world of elves, wizards and dragons. The series was originally released by Tor Books, and comprised three books: Elvenbane (1991), Elvenblood (1995), Elvenborn (2002). Elvenbred, the fourth book in the series, remained unfinished due to the death of Andre Norton.

                • Cover of Narnia
                  Narnia

                  series · 26 books · 1950

                  part of Narnia Universe

                  similar byadventurouscoming of agesecondary worldfantasy+1 more

                  The Chronicles of Narnia is a series of seven portal fantasy novels by British author C. S. Lewis. Illustrated by Pauline Baynes and originally published between 1950 and 1956, the series is set in the fictional realm of Narnia, a fantasy world of magic, mythical beasts, and talking animals. It narrates the adventures of various children who play central roles in the unfolding history of the Narnian world. Except in The Horse and His Boy, the protagonists are all children from the real world who are magically transported to Narnia, where they are sometimes called upon by the lion Aslan to protect Narnia from evil. The books span the entire history of Narnia, from its creation in The Magician's Nephew to its eventual destruction in The Last Battle.

                • Cover of Hurog
                  Hurog

                  series · 2 books · 2002

                  similar bydragonssecondary worldfantasy+3 more

                  Patricia Briggs's Hurog duology follows Ward, heir to the crumbling mountain holding of Hurog, who has spent his life feigning simple-mindedness to survive his abusive father and scheming relatives' contempt for a perceived weakling. Dragon Bones opens as his father's death forces Ward to finally act, uncovering old magic tied to the dragon bones buried beneath Hurog's keep as war looms over the wider kingdom; Dragon Blood carries the stakes into open conflict. It is a duology about hidden competence and reclaiming an underestimated inheritance.

                • Cover of Seraphina Universe
                  Seraphina Universe

                  series · 6 books · 2012

                  similar bysecondary worldfantasy+4 more

                  Among Ghosts (2025) is Rachel Hartman's most recent return to the world she introduced in Seraphina, extending the setting beyond the original duology. It belongs to Hartman's wider Seraphina-world writing rather than continuing as a numbered sequel in the core two-book series.

                • Cover of The Roots of Chaos
                  The Roots of Chaos

                  series · 3 books · 2019

                  similar byepic fantasydragonssecondary world+2 more

                  Samantha Shannon's The Priory of the Orange Tree opens a feminist retelling of the Saint George and the Dragon myth: Queen Sabran the Ninth of Inys faces pressure to secure an heir and hold her divided realm together as an ancient draconic enemy stirs. Multiple viewpoints carry the story, including Ead Duryan, a lady-in-waiting secretly protecting the queen through forbidden magic, and Tané, a dragonrider facing a life-changing choice, as Eastern and Western powers edge toward war instead of alliance. A Day of Fallen Night, set generations earlier in the same world, continues the Roots of Chaos cycle.

                • Cover of The Riftwar Universe
                  The Riftwar Universe

                  universe · 44 books · 1982

                  Start hereRiftwar Saga · Start here

                  similar byepic fantasysecondary worldfantasy+1 more

                  On the world of Midkemia a tear opens in the air itself, a rift hung between stars, and through it march the armies of an empire from another world entirely. So begins the chronicle Raymond E. Feist has kept for three decades: the tale of Pug, a castle kitchen boy apprenticed to a magician on the very day the invasion lands, and of Tomas, his friend, who inherits the armor and the ancient fury of a dead dragon-lord. Around these two the Riftwar Cycle turns, widening book by book from one besieged frontier keep into the whole history of a world of kingdoms, guilds, thieves' dens and mage-towers. The cycle runs to roughly thirty novels, gathered into arcs a newcomer can enter and finish on their own. The founding Riftwar Saga (Magician, Silverthorn, A Darkness at Sethanon) sets the board; the Serpentwar Saga, Krondor's Sons and the Conclave of Shadows carry the story down the generations; the Darkwar, Demonwar and Chaoswar sagas bring it toward its close. Crossing the rift to the rival world of Kelewan, Feist and Janny Wurts wrote the Empire trilogy, opening with Daughter of the Empire, a court intrigue told wholly from the invaders' side and for many the finest thing here. Shorter Legends of the Riftwar and the game-born Riftwar Legacy fill the corners; later still, Feist opens an altogether new world in the Firemane books. Feist writes fantasy in its most companionable key: apprentices who grow into archmages, tavern boys who become spies and dukes, a world you return to the way you return to an old inn. The mood is adventure before dread, friendship and rank and hard-won craft, wars that cost something, all of it rendered plainly and at a gallop. Begin where it began, with Magician, then follow the arcs in the order they were written, and the rift will carry you the rest of the way.

                • Cover of Wings of Fire
                  Wings of Fire

                  series · 24 books · 2012

                  similar byadventurousdragonssecondary worldepic fantasyfantasy+1 more

                  Wings of Fire is a children's adventure fantasy novel series about dragons, written by Tui T. Sutherland and published by Scholastic Inc. The series has been translated into over ten languages, with some versions having their own cover art, has sold over 30 million copies worldwide making it one of the most successful fantasy series for young readers, and has been on the New York Times Best Seller list for over 300 weeks. Wings of Fire is rated for ages 7–12 according to Scholastic, Inc. The series has also proven popular with young adults and older audiences.

                • Cover of The Wizard Knight
                  The Wizard Knight

                  series · 2 books · 2004

                  completed

                  similar byadventurousepic fantasycoming of agesecondary worldfantasy

                  The Wizard Knight is a series of epistolary novels written by fantasy and science fiction author Gene Wolfe. It chronicles the journey of Able of the High Heart, an American boy transported to a magical world and supernaturally aged to adulthood. Able becomes a knight, and because of his connection with the magical and spiritual elements of the world around him is soon also dubbed a wizard.

                • Cover of The Black Magician Trilogy
                  The Black Magician Trilogy

                  series · 3 books · 2001

                  part of Kyralia series

                  similar byepic fantasysecondary worldfantasy+2 more

                  Trudi Canavan's Black Magician Trilogy (The Magicians' Guild, The Novice, The High Lord, 2001-2003) opens in the city of Imardin, where the ruling magicians' guild's annual purge of the slums goes wrong when a street girl named Sonea unknowingly shatters their protective shield with raw, untrained power. The guild must hunt her down and decide whether to control her or train her, and the trilogy follows Sonea's forced initiation into magical society and the guild's internal politics. It's Canavan's best-known trilogy and the founding story of her Kyralia setting.

                • Cover of Dragonlance
                  Dragonlance

                  universe · 436 books · 1984

                  Start hereDragons of Autumn Twilight · Start here

                  similar byepic fantasysecondary worldfantasy+2 more

                  The gods have kept their silence over Krynn for three hundred years, and the world has learned to make do without them: the dragons are a nursery tale, the old clerics gone, faith worn down to superstition. Then strangers bearing a blue crystal staff cross an autumn road, and shadows with wings blot out the three moons. This is a world where magic answers to those moons—white, red, and black—where a lance is the only weapon a dragon fears, and where the fate of nations turns on a handful of friends who meet again at a tavern table and find the age of legend has come for them. At its heart stand Margaret Weis and Tracy Hickman's twin trilogies. Chronicles—Dragons of Autumn Twilight, Winter Night, and Spring Dawning—follows the Heroes of the Lance through the War of the Lance; Legends turns inward to the twins, the frail mage Raistlin and his warrior brother Caramon, and the bargain a man will strike for power. Around this core Krynn sprawls across five ages and hundreds of volumes by many hands: The Raistlin Chronicles, The War of Souls, the Preludes and Meetings cycles, the Tales anthologies, with Richard A. Knaak, Douglas Niles, Jean Rabe, and Chris Pierson each adding elf-kingdoms, dragon-overlords, and long-buried history. It is a shared world—vast, uneven, honestly enormous. What sets Dragonlance apart is its warmth. This is heroic fantasy of fellowship and hard choices rather than grimness—the companionship of the road, courage measured against temptation, gods who watch to see whether mortals deserve them back. Begin with Chronicles, then read Legends; that pairing is the doorway every reader and both creators point newcomers through.

                • Cover of Millennium's Rule
                  Millennium's Rule

                  series · 4 books · 2014

                  similar byepic fantasysecondary world+3 more

                  Millennium's Rule is set across multiple worlds that only certain travelers can cross between, opening with Tyen, an archaeology student who unearths a sentient, centuries-old book named Vella, and Rielle, a dyer's daughter hiding forbidden magical talent in a society ruled by priests who forbid it. Trudi Canavan follows both of them as their discoveries chip away at what their worlds have taught them about magic, history, and who holds power. The series runs Thief's Magic, Angel of Storms, and Successor's Promise.

                • Cover of Hierarchy
                  Hierarchy

                  series · 2 books · 2023

                  similar byadventurousepic fantasycoming of agesecondary world

                  James Islington's Hierarchy series opens with The Will of the Many, set in the Catenan Republic, an empire built on 'Will' — citizens' personal strength and drive, ceded upward to those in power. Its protagonist infiltrates the empire's most prestigious academy under a false identity to investigate a murder and search for a hidden weapon, refusing to surrender his own Will to the empire that killed his family. The Strength of the Few continues the story as book two.

                • Cover of Dragon Jousters
                  Dragon Jousters

                  series · 5 books · 2003

                  similar byadventurousdragonssecondary worldfantasy+2 more

                  Mercedes Lackey's Dragon Jousters series is set in an Egyptian-flavored fantasy world where warring kingdoms ride tamed dragons into battle. It follows Vetch, a conquered boy forced into servitude as a dragon boy who ends up bonding with and training a dragon of his own, complicating his place between enemy nations. The five novels trace his rise from serf to jouster across a continuous story published in the mid-2000s.

                • Cover of Enchanted Forest
                  Enchanted Forest

                  series · 7 books · 1985

                  similar bydragonssecondary worldfantasy+2 more

                  Patricia Collins Wrede is an American author of fantasy literature. She is known for her Enchanted Forest Chronicles series for young adults, which was voted number 84 in NPR's 100 Best-Ever Teen Novels list.

                • Cover of The Saga of Recluce
                  The Saga of Recluce

                  series · 48 books · 1991

                  similar byepic fantasysecondary worldfantasy+1 more

                  The Saga of Recluce is a series of fantasy novels written by L. E. Modesitt Jr. The initial novel in the series, The Magic of Recluce, was published in 1991. The series is still in publication with the latest novel published in June 2026. In 2015 Modesitt stated that the (then) 20 novels in the Recluce series had sold nearly three million copies.

                • Cover of Dragonbards
                  Dragonbards

                  series · 3 books · 1985

                  completed

                  similar byadventurousepic fantasydragonssecondary worldfantasy+1 more

                • Cover of Pellinor
                  Pellinor

                  series · 5 books · 2002

                  similar byadventurousepic fantasysecondary worldfantasy+1 more

                  Maerad has spent most of her life enslaved on a remote farm, until the wandering Bard Cadvan recognizes in her the Gift -- a rare and powerful magical ability -- and takes her from captivity into training. Alison Croggon's Books of Pellinor follow Maerad across the world of Edil-Amarandh as she's drawn into a prophecy naming her the only one who might stop the Nameless One, an ancient and corrupting sorcerer, while she also searches for her lost family. The series runs through The Gift, The Riddle, The Crow, The Singing, and the later prequel The Bone Queen.

                • Cover of Beklan Empire
                  Beklan Empire

                  series · 2 books · 1974

                  completed

                  similar byepic fantasysecondary worldfantasy+2 more

                  Two standalone novels by Richard Adams set in the same invented world, the Beklan Empire, an ancient, quasi-Mediterranean land of god-kings, slave markets, and warring city-states. Shardik (1974) follows a hunter swept into a religious and military frenzy over a giant bear believed to be the vessel of a god; Maia (1984) turns to an earlier generation of the empire and follows a slave girl's rise through its court and conquests. The two novels share only their setting, not characters or plot.