After defeating Clayman at Walpurgis, Rimuru officially became a Demon Lord and a member of Octagram. Meanwhile Diablo awaits Rimuru's return in Tempest, and is anxious to learn about his master's activities as soon as possible. A look back at Walpurgis.
As of this day, you are 
acknowledged as a Demon Lord.
اعتباراً من هذا اليوم، تمّ الاعتراف
بك كسيّد شياطين
Permito que te presentes
como Rey Demonio.
Permito que te presentes
como Rey Demonio.
Dorénavant, je t’autorise
à porter le titre de roi-démon.
Accetto che tu ti definisca un Re demone.
A partir de hoje você será
reconhecido como Lorde Demônio.
С этого момента я разрешаю тебе
 называться Князем Тьмы.