That Time I Got Reincarnated as a Slime Season 4

Rimuru Tempest and his Tempest Federation face challenges of a much higher order, where diplomacy is no longer enough and the theater of war shifts to the tables of the Great Kings and Demon Kings. With threats coming directly from the Eastern Empire and ancient conspiracies ready to explode, our favorite slime must unleash his claws and utilize his supreme powers to the fullest to protect his people. Between tense strategic clashes, new alliances between powerful nations, and terrifyingly powerful monsters ready to descend upon the battlefield, Rimuru proves once again that anyone who steps on his nation's toes will meet a decidedly grim end.