look for secrets. Found a ghost with dialog from praedeth in the trial of kabr (the alternate, secret path), it's near the begining of it to the right.
Edit: Dieing will reset the ghosts you have collected, it may be wiping, doing all this solo. Getting off so I won't be able to edit this, someone else will make a good thread with all the locations.
Reddit info thread [url=https://m.reddit.com/r/DestinyTheGame/comments/3nopdt/found_memory_vault_of_glass/]Here[/url]
English
#Destiny
-
I just did this solo i thought it was something refreshing and fun to do shame theres no hidden exotic or you get a quest from handing in the ghost :(