More like The Final Key

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The Saga of Seven Suns UniverseSeries
series16 books2002
About aliens.
Start with Hidden Empire →
HonorverseUniverse
universe83 books1993
Set in other star systems and space.
“At the center stands one officer, Honor Harrington — captain, then something far larger — and the six-limbed empathic treecat who rides her shoulder.”
from the catalogue
Start with On Basilisk Station →
includes Honor Harrington, Saganami Island, Worlds of Honor anthologies, Expanded Honorverse, Wages of Sin, Manticore Ascendant, Honor Harrington Universe short fiction, Star Kingdom (Honor Harrington)
VattaUniverse
universe10 books2003
Set in space and other star systems.
“Get kicked out of the Academy and the family still hands you a ship.”
from the catalogue
Start with Trading in Danger →
includes Vatta's War, Vatta's Peace
DuneUniverse
universe78 books1963
Set in other star systems.
“The desert planet, where empire runs on a single substance: the spice melange, which folds space, prolongs life, and unlocks prescience, and which exists nowhere else in the known universe.”
from the catalogue
Start with Dune →
includes Dune, Dune Sequels, Dune Prequels, Heroes of Dune, Background of the Dune Universe
JanissariesSeries
series4 books1979
About slavery, set in other star systems.
“Janissaries are an American series of military and political-based science fiction novels are set in an interstellar confederation of races, in which humans are a slave race entrusted with military affairs and law enforcement.”
from the catalogue
Start with Janissaries →
CommonwealthUniverse
universe12 books2002
Science fiction and space opera, set in far future.
“Step aboard the train at the Second Chance terminal and ride the wormhole to another star.”
from the catalogue
Start with The Dreaming Void →
includes Commonwealth Saga, Void Trilogy, Chronicle of the Fallers