Fuse
That Time I Got Reincarnated as a Slime, Vol. 12 (light novel)

THE GEARS OF WAR BEGIN TO TURN Threatened by Tempest’s continued rapid expansion, the Eastern Empire finally starts setting the stage for all-out war with the monster nation.

According to Chloe, the time-traveling Hero, there exists a timeline in which the Empire kills Rimuru and Tempest subsequently collapses.

While Rimuru’s doom isn’t set in stone, his victory isn’t a foregone conclusion either.

This may be a different timeline, but the slime demon lord nonetheless steps up his guard-and just as he does, several Imperial spies infiltrate Tempest…