The Dungeons of the Old were difficult to explore. Every room, every corridor within the ruins was dark since it didn't have a host to maintain it, and keep it well lit. This place was ruined, after all. The darkness within the ruins was a solid contributor to why it was difficult to explore it, but there were also other, far more concerning reasons.
“We're gonna run out of mana really quick,” Tim sighed, citing the main reason why these ruins were difficult to deal with.
“Well, you all are using fire as substitutes for torches, so we were wasting mana anyway.” Gustav pointed out, “Let's hope we don’t have to use our fancy magic at all.”