Please watch the video link and help me figure out what this is! I found a strange faint blue mist that makes you follow it around what appears to be an unmarked grave and empty cave. At around 0:30 in the video, after I've been following the mist for a bit, I began to hear a strange ghostly "roar". It could just be a random easter egg, but knowing Destiny, a lot of this kind of stuff happens for a reason. Can anyone play around with this and maybe figure out if there is a pattern to this? I'm suspicious of this maybe being a quest of some kind which may lead to some kind of reward.