The Horus Heresy Primarchs series
The Horus Heresy Primarchs series in Warhammer 40,000 has 15 novels, published from 2016 to 2022 by 8 authors. None of them carries a series number, so the list below runs by release year, from Roboute Guilliman: Lord of Ultramar (2016).
All 15 books in order
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Good first read: easy for newcomers
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