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...
How about steel threads?
ماذا عن خيوط فولاذيّة؟
Was ist mit Stahlfäden?
¿Y unos hilos de acero?
¿Y unos cables de acero?
Et des fils d’acier ?
Allora anche dei fili d'acciaio!
Que tal fios de aço?
Очень советую стальные нити!