To put a stop to Clayman's plans, Rimuru uses transport magic on a large scale to both move Tempest's army to Eurazania and evacuate the people of Eurazania to Tempest. Rimuru also decides to crash Walpurgis, the Demon Lords' banquet, in order to settle the score with Clayman personally. Since this will be a return match for Shion, he decides to take her and Ranga along. New military forces are organized in Tempest in preparation for the battle against Clayman's army. At last, the eve of battle is upon them...
He probably anticipated Walpurgis taking 
place three nights from now, too.
غالباً توقّعَ انعقاد والبورغيس بعد ثلاث
ليالٍ من الآن أيضاً
Ich kann mir gut vorstellen,
dass in drei Tagen die Walpurgis abgehalten wird.
Tenía planeado el Walpurgis
de dentro de tres noches.
Tenía planeado el Walpurgis
de dentro de tres noches.
La tenue du Walpurgis dans trois jours
doit faire partie de ses plans…
Immagino che anche tenere il Walpurgis
tra tre notti sia per questo.
Também deve ter previsto que o Walpurgis
aconteceria três noites a partir de agora.
Видимо, он учитывал, что Вальпургиева ночь
случится через три дня…