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1. Birth of a Celestial Sanctuary by Nightmix

   Fandoms: 転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse  

   • Explicit
   • Creator Chose Not To Use Archive Warnings
   • M/M
   • Work in Progress

   07 Aug 2026

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Rimuru Tempest/Veldora Tempest
   • Rimuru Tempest & Veldora Tempest
   • Ifrit & Veldora Tempest
   • Ranmaru Tempest
   • Veldora Tempest
   • North | Great Sage
   • Gobta
   • Rigurd
   • Rigur
   • Benimaru
   • Shion
   • Hakuro
   • souei
   • Kurobe
   • Gabiru
   • Yashichi
   • Kakushin
   • Souka
   • Abil
   • Kaijin
   • Kaidou
   • Garm
   • dold
   • Myrd
   • Vesta
   • Gazel Dwargo
   • Dolf
   • Treyni
   • Trya
   • Ranga
   • Geld - Character
   • Geld Senior
   • Fuze
   • Kaval
   • Eren
   • Gido
   • Laplace
   • Gelmud
   • Milim Nava
   • Shizu
   • Leon Cromwell
   • Ifrit
   • Original Child Character(s)
   • Alternate Universe - Canon Divergence
   • Non-canon Character Development
   • Empath Ranmuru
   • Ranmuru is a Qilin
   • Slow Burn
   • Slow Burn Romance
   • Falling In Love
   • Mates
   • Smut
   • Great Sage Goes by a Different Name
   • Celestial Beast Ranmuru
   • world building
   • Alternate Evolutions
   • Powerful Ranmuru
   • Powerful Veldora
   • Otaku Veldora
   • Otaku Ranmuru
   • Brotherly Ifrit
   • There is a Book Club
   • Awkward Veldora
   • Ranmuru Falls in Love First
   • Veldora Falls Harder
   • Ranga's Dad Lives
   • Found Family
   • Ogre Squad
   • Protective Ogres
   • Orc Redemption
   • Geld is a Good Egg
   • From Enemies to Allies
   • Other tags to be added
   • Rimuru Tempest is Ranmaru Tempest

   Summary

   What if Rimuru Tempest was never a slime?

   What if, instead, the Voice of the World sent a celestial beast crashing into the Sealed Cave — ancient, luminous, and trailing flowers with every step? What if the first thing Veldora Tempest saw after three hundred years of isolation wasn't a small blue creature, but a falling star that walked through his prison and asked if he was lonely? What if he went by a different name?

   Everything is the same. Everything is different. And the sanctuary Ranmaru Tempest builds will shake the world to its foundation.

   Series

   • Part 1 of The Sovereign Comet

   Language:

   English

   Words:

   72,042

   Chapters:

   12/?

   Comments:

   103

   Kudos:

   241

   Bookmarks:

   78

   Hits:

   5,304