Prologue - The One Whose Anger You Should Fear The Most

In an alternate timeline of That Time I Got Reincarnated as a Slime, Falmuth attacks a week early, and a series of unfortunate coincidences lead to Falmuth occupying and defeating Tempest Forces in Rimuru City. Rimuru returns. seeing his former subordinates dead, and eradicates Falmuth's army. Left with only the survivors, Rimuru sets out to rebuild and get revenge as the Federation ends, and the Empire Rises.

(cover art by enrickoalg on Fiverr/Rikoen on Deviantart)