Rimuru is building a dungeon in preparation for the upcoming festival. It will feature treasure chests containing weapons made by Kurobe, and Veldora will inhabit the deepest floor as the final boss. Then Milim suddenly shows up with a suggestion...
until it achieves 
Legend-grade functionality.
حتّى يحقِّق وظيفة درجة أسطورة
und so die Fähigkeiten
eines Legend-Items erhalten.
hasta alcanzar un rango legendario.
hasta alcanzar un rango legendario.
jusqu’à atteindre
le niveau légendaire.
fino a raggiungere il livello leggendario.
até atingir a funcionalidade
de nível Lendário.
да так и дорастёт
до легендарного ранга.