A new force has suddenly risen to power in the Great Forest of Jura, and its leader, Clayman, proposes that the Demon Lords hold Walpurgis with the goal of sanctioning the slime who deceived him. Rimuru also begins to prepare for a battle with Clayman, but observing the enemy army's movements reveals that Clayman's target is not Tempest, but Eurazania. Clayman's army will arrive in Eurazania within two days. Can Rimuru's forces get there in time?
when the Demon Lords assemble, 
a great war ensues.
متى اجتمع أسياد الشّيطان، تندلع حرب عظيمة
dass dann große Kämpfe
zwischen Dämonenkönigen ausbrechen.
-que se reunieron y comenzó una guerra.
-¿Una guerra?
-que se reunieron y comenzó una guerra.
-¿Una guerra?
« Les rois-démons se réunirent,
et ce fut la guerre. »
"Quando i Re demoni si riuniscono,
si scatena una grande guerra."
"Quando os Lordes Demônios se reúnem,
uma grande guerra eclode."
«Князья Тьмы собрались —
и прогремел горн войны!»