More like The Overworld

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Tolkien's legendariumUniverse
universe163 books1923
Fantasy, set in secondary world.
“Before the seas were bent and the mountains raised, there was Music — and from that Music came Arda, and in the west of Middle-earth the long defeat and stubborn hope of those who dwell there.”
from the catalogue
Start with The Fellowship of the Ring →
includes The Hobbit, The Lord of the Rings, The History of Middle Earth, The Fall of Gondolin, The History of the Lord of the Rings
Dying EarthSeries
series27 books1950
Fantasy, about wizards, set in secondary world.
“Vance returned to the setting in 1965 and thereafter, making it the first book in the Dying Earth series.”
from the catalogue
Start with The Dying Earth →
World of Septimus HeapSeries
series12 books2005
Start with Magyk →
Howl's CastleSeries
series3 books1986
completed
Fantasy, adventurous and whimsical in tone, set in secondary world.
Start with Howl's Moving Castle →
TortallUniverse
universe25 books1983
About coming of age.
“In Tortall she does it anyway — and earns the right the hard way, through bruises, cold mornings in the training yard, and the slow winning-over of people who swore she'd fail.”
from the catalogue
Start with Alanna: The First Adventure →
includes The Immortals, Song of the Lioness, Beka Cooper / Provost's Dog, Protector of the Small, Daughter of the Lioness, The Numair Chronicles
Angel MageNovel
Garth Nixstandalone novel2019
About angels.