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?
The day on which the Demon Lords gather was 
named "Walpurgis" by the Western Holy Church.
اليوم الّذي يجتمع فيه أسياد الشّيطان سُمّي
بـ"والبورغيس" بواسطة الكنيسة المُقدّسة الغربيّة
Die Westliche Heilige Kirche
hat solchen Tagen
La Iglesia Occidental nombró Walpurgis
al día de la reunión.
La Iglesia Occidental nombró Walpurgis
al día de la reunión.
Le jour même du banquet,
È stato il Sacro concilio dell'ovest a chiamare "Walpurgis" 
il giorno in cui i Re demoni si riuniscono.
O dia em que os Lordes se reúnem foi chamado
de "Walpurgis" pela Igreja Sagrada Ocidental.
Насколько мне известно,