Speaking of dynamic lighting, it would be great to have completely dark caves in ARR. The player would have to get a torch or a special item to be able to see and navigate the cave easily.

Right now, most caves should be completely dark, but for some mysterious reason every single cave wall in Eorzea emit light.
On the other hand, Cassiopeia Hollow, for example, contains numerous phosphorescent plants which would be an example of a cave that doesn't require any torch or special lighting item.