Yuuki is saddened by the death of Clayman, and Luminus is saddened by the death of Roy. Steeped in sadness, and having lost their friends, they seek their next move against Rimuru, who has grown in power and become a true Demon Lord.
This was my mistake. 
I underestimated the Demon Lords.
كانت هذه غلطتي. استهنتُ بأسياد الشّياطين
Das ist mein Fehler gewesen.
Fue error mío.
Ha sido error mío.
Mon plan laissait à désirer.
È colpa mia.
Este erro foi meu. Eu subestimei
os Lordes Demônios.
А виноват в этом я…
Недооценил Князей Тьмы.