Since Levi still needed those materials at Restricted Area 76 to fight Lab of Gods, he could not simply use them for Shelters.
If he were to get other materials for the construction, seeking Erudia's help seemed like the best option. I have to tend to this matter personally because we don't have much time left!
Get more PearlsTop Up
Go to Joyread app
Then you can read more chapters. And you'll find other wonderful stories on Joyread.