The dark spirit attacks Saitou and the others with powerful light magic. Even working together, it’s all the skilled adventurers can do to defend themselves. Then Saitou suggests a measure that could turn the seemingly hopeless situation around.
Is it because of what 
I've invested in the lab?
أذلك بسبب ما استثمرتُه في المختبر؟
¿Es por lo que invertí en el laboratorio?
¿Es por lo que he invertido
en el laboratorio?
È perché ho speso tutti i nostri risparmi 
nelle mie ricerche?
É por causa do que investi 
no laboratório de magia?
Потому что я всё
вложил в лабораторию?..