The Imperial Invasion

The Imperial Invasion (帝国侵攻編) is the thirteenth volume of the That Time I Got Reincarnated as a Slime Light Novel.

Synopsis
ABANDON HOPE, ALL WHO ENTER HERE

The Eastern Empire’s vast army (over 900,000 strong) is ready to invade the Forest of Jura. Thanks to Ramiris’s mind-boggling powers, Tempest’s entire capital—buildings, inhabitants, and all—has been evacuated into the nation’s labyrinthine Dungeon. While Primordial Daemons Testarossa and Ultima kick some serious imperial butt over on the front lines, the rest of the Empire’s army attempts to storm the Dungeon. Little does the enemy know, however, that they’re about to face a devastating bloodbath at the hands of Tempest’s own mighty forces…

Chapters

 * Prologue: Two Misgivings
 * Chapter 1: Unrest and Resolve
 * Chapter 2: The Assault Begins
 * Interlude: Gazel's Melancholy
 * Chapter 3: Battle of the Labyrinth
 * Chapter 4: Total Victory
 * Epilogue: The Deeds of A Demon Lord

Adaptations
This volume was adapted into the following material:

Manga:
 * To Be Added.

Anime:
 * To Be Added.