Rimuru learns about Clayman and the schemes of the Kingdom of Falmuth, but no matter how hard he wishes for it, his fallen comrades and their peaceful lifestyle will never return. He's just about to give up when Eren tells him of a fairy tale that might offer a glimmer of hope. The probability of success is about 3%... but if Rimuru can manage to become a Demon Lord by taking in the souls of 10,000 humans as nourishment, he just might have a chance at bringing his comrades back to life. As Falmuth's army of 20,000 men marches toward Tempest, Rimuru takes hold of that hope and decides to become a Demon Lord.
It's an artificial heart I made 
based on this temporary one.
إنه قلب اصطناعي صنعتُه اعتماداً
على هذا القلب المؤقّت
Ich habe dein provisorisches Herz
als Blaupause genutzt und ein neues gemacht.
Hice un corazón artificial
basándome en este temporal.
Hice un corazón artificial
en base a este temporal.
Du cœur artificiel
que j’ai créé à partir de l’ancien.
È un cuore artificiale che ho creato 
basandomi su questo temporaneo.
Um coração artificial que criei
baseado no coração temporário.
Вместо этого фальшивого
я создал тебе искусственное сердце.