That Time I Got Reincarnated as a Slime, Vol. 15 (light novel)

After a fierce battle, Veldora has fallen into the enemy's clutches, andRimuru is
furious. The order comes down to unleash a massacre, and Benimaruand the other
Tempest executives couldn't be more thrilled. The fuse has beenlit for the final battle
between Tempest and the Eastern Empire. But if hewants to save Veldora, Rimuru will
need to evolve even further. It's time torelease the power he's been holding back!