Currency

"Yeah, one day and a half," Rain said after he relaxed a bit, even though he only needed three hours to pass those zones. 

"Anyway, we all here did the same, and since then, we have been living here," The bear-looking guy said. "If you want to know more, look for a tavern. There are guys who sell information there."

"Wait, what is this place?" Rain asked when the guy turned around to leave.

"Isn't it obvious? It is a prison," The bear-looking guy said and then left.

That didn't look like a prison at all… in any case, Rain could only assume that all the people around were from all over the universe and were captured by the enemies that captured Rain and the others as well. It was hard to say if they came from advanced civilizations, and they were finished and captured and put there for unknown reasons.