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?
I got all cocky and impertinent 
with a Demon Lord,
،اغتررتُ وتعاملتُ بوقاحة مع سيّد شياطين
Ich hab mir über einen Dämonenkönig
das Maul zerrissen
J’ai pris de haut un roi-démon
Mi sono vantato davanti a un Re demone
Fiquei me achando pra cima de um
Lorde Demônio até ele perder a paciência,
Это получается, 
я поливал грязью Князя Тьмы?!