The Abyss Unleashed

Abyss Unleashed (深淵解放編) is the fifteenth volume of the That Time I Got Reincarnated as a Slime light novel.

Synopsis
After a fierce battle, Veldora has fallen into the enemy's clutches, and Rimuru is furious. The order comes down to unleash a massacre, and Benimaru and the other Tempest executives couldn't be more thrilled. The fuse has been lit for the final battle between Tempest and the Eastern Empire. But if Rimuru wants to save Veldora, they'll need to evolve even further. It's time to release all the power that's been held back!

Chapters

 * Prologue: Flame Dragon Against Storm Dragon
 * Chapter 1: The Moment of Despair
 * Chapter 2: Power Unbound
 * Chapter 3: The Battlefield Rages
 * Chapter 4: The Eight Impervious Gates
 * Chapter 5: The Truth Behind the Emperor
 * Epilogue: Sister and Brother

Adaptations
This volume was adapted into the following material:

Manga:
 * To Be Added.

Anime:
 * To Be Added.