Rimuru confirms that it was Gustav who cursed Zenobia with illness. It turns out he and his accomplice, Carl, are Archdemons plotting to manifest their god using Zenobia as a vessel. Can Rimuru stop them before the Kingdom of Coleus is lost?
A fusion between demons is so difficult 
that it is considered taboo.
الاندماج بين الشّياطين صعبٌ للغاية
لدرجة يُعَدُّ مُحرَّماً
Das Verschmelzen zweier böser Geister ist
so schwierig, dass es ein Tabu darstellt.
Fusionner entre démons est si ardu
que c’en est réprouvé.
La fusione di due diavoli è una pratica difficile, 
al punto da essere considerata tabù.
A fusão entre demônios é tão difícil
que é considerada um tabu.
Слияние демонов запрещено 
и считается табу.