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   The Forgotten Son [30k 2nd Primarch SI/R63] by Jajasx222

   Fandoms: Warhammer 40.000  

   • Explicit
   • Graphic Depictions Of Violence, Major Character Death, Underage Sex
   • F/M
   • Work in Progress

   23 Apr 2026

   Tags

   • Graphic Depictions Of Violence
   • Major Character Death
   • Underage Sex
   • Alexander (OC Primarch)/OC
   • Emperor of Mankind (Warhammer 40.000)
   • Original Primarch Character(s) (Warhammer 40.000)
   • Original Adeptus Astartes | Space Marines Character(s) (Warhammer 40.000)
   • Original Female Rogue Trader Character(s) (Warhammer 40.000)
   • Original Characters
   • Sanguinius (Warhammer 40.000)
   • Lorgar Aurelian
   • Konrad Curze
   • Ariana (OC)
   • Penelope (OC)
   • deamons - Character
   • Roboute Guilliman
   • Chaos Gods (Warhammer 40.000)
   • R63 - Character
   • Rebellion
   • The Great Crusade Era (Warhammer 40.000)
   • Military
   • War
   • Xeno
   • Xenophobia
   • Kingdom building
   • Empire Building
   • Size Difference
   • Size Kink
   • Oral Sex
   • Blood and Gore
   • ODST Orbital Drop Shock Trooper(s)
   • Trans Deimos (Madness Combat)
   • Grimdark
   • Planetary Rebellion

   Summary

   In an alternate Warhammer 40,000 universe, a modern-day fan‑fiction author is reborn as Alexander, the long‑lost Second Primarch. Thrown to a hive world beneath xenos yoke, he will confront daemonic nightmares, forge new empires, and redefine what it means to be human in a galaxy ablaze in the name of the Empress.
   Wait... the Empress?!

   Language:

   English

   Words:

   183,572

   Chapters:

   40/?

   Comments:

   116

   Kudos:

   370

   Bookmarks:

   141

   Hits:

   23,124

   Bookmarked by Cyberman4

   28 Mar 2026