Again (2)
The group walked for two days, only stopping to rest for a few hours in the afternoon and to eat. While they weren't that tired physically, even Luke was tired mentally. Doing the same thing over and over again was exhausting in more ways than one. That area was one that they rarely used over their history, so they didn't know it very well. Still, Luke felt satisfied with it. He could create a cave himself, after all.
The elves didn't look all that satisfied while Luke was creating a cave by using Water Manipulation. Using Earth Manipulation would have made things even more simple, but that was more than enough for the time being. Besides, Luke could also use Rina's mana pool.
"I am sorry, our people usually live in open areas, caves aren't full of life like forests and springs, so we feel uncomfortable in such places," Rina explained. "Please bear with their behavior for a while longer until they get used to it."