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.
that this temporary heart 
Clayman put in Mjurran
أنّ هذا القلب المؤقّت الذي زرعه
كلايمان في ميولان
Clayman musste ihr provisorisches Herz,
das er ihr verpasst hat,
descubrí que, con el corazón
que te dio Clayman,
descubrí que con el corazón
que te dio Clayman
que le cœur temporaire
donné par Clayman à Myulan
In pratica questo cuore temporaneo 
che Kleiman aveva messo in Myuran
que esse coração temporário que
Clayman colocou na Myulan
Клейман использовал твоё искусственное
 сердце, чтобы следить за тобой.