So I finally reaches a lvl/rank where mobs in Mor Dhona could not one shot me, so I decided to explore it. I was able to find some interesting caves, and one had mobs called "fallen soldiers" and they were wearing Garlean Armor. They didn't act like Garleans soldier I've fought before. More like some sort of Zombie

Anywho, what is with the purple and blue fog?

Also, there were these shining dots similar to mining spots, but you could not mine them, and when selected they only display question marks. Any ideas?