Responding to Rimuru's concerns about monsters in the forest harming humans, Vesta and Kaijin reveal a new invention they hope will keep the road to Tempest safe. Also, Rimuru assigns a new task to Geld.
When a magicrystal is converted to magic, 
90% of it goes to waste.
،عندما تُحوَّل بلّورة سحريّة إلى سحر
فإنّ 90% تُهدَر هكذا
Wenn man Magiekristalle
in Magie umwandelt,
Quand un cristal magique
est converti en magie,
Se un cristallo magico
viene convertito in potere magico,
Quando um cristal mágico é convertido
em magia, 90% dela é perdida.
При обращении маглесталла в ману
КПД составляет менее 10%.