From Destinypedia, the Destiny wiki
All dialogue is spoken through the Ghost's comms.
The Guardian arrives at the Waking Ruins. The area is in a state of disarray. Several Vex have become extremely damaged, twitching sporadically and firing their weapons aimlessly as though they are somehow corrupted.
The Guardian reaches the front of the Vault of Glass and finds eight Goblins standing at the door, pointing at the entrance.
If the Guardian chooses to attack the Goblins anyway:
Upon approaching the entrance, the Goblins turn toward the Guardian, lower their weapons, and stand erect in a non-threatening stance. The door opens as the Goblins stand aside. The Guardian makes their way further inside, receiving another message from Praedyth:
The Guardian continues deeper, encountering more Vex firing and behaving erratically; eventually arriving at the Templar's Well. An eerie silence runs through these hallowed halls. The Guardian jumps down, heading towards the exit on the far side. However, the exit is suddenly blocked, and Taken Blights form everywhere. Several dozen Taken appear throughout the Well, and the Guardian is forced to fight them. They are, eventually, victorious.
Alternatively, if the Guardian ventures beneath the main entrance, they may find a dead Ghost, with a memory of Praedyth:
After defeating the Taken, the Guardian moves further down.
Alternatively, if the Guardian finds another Ghost, a second memory will play:
The Guardian approaches the massive drop to the Gorgon's Labyrinth. Several Taken Hobgoblins guard the area, which is heavily fogged with Taken blight. Their presence is overwhelming.
As soon as the Ghost finishes that sentence a familiar Vex roaring noise is heard, echoing through the chamber. As the Guardian reaches the rear of the Labyrinth, a giant Hydra appears: Morphon, Blighted Mind. The Taken Vex mind is surrounded by Taken Goblins, Taken Hobgoblins and Taken Minotaurs.
The Guardian attacks Morphon and its many defenders. Eventually, the Hydra teleports to another location. Upon opening fire, the Guardian finds Morphon heavily shielded. A few Oracles are seen floating nearby. The Guardian takes them out, leaving the Ultra dazed and vulnerable. The Guardian continues attacking it until a detainment shield surrounds them. Quickly breaking it, they find the Hydra and continue fighting until it succumbs to its damage and dies. The Taken fog lifts, and the remaining forces retreat. The Labyrinth is finally silent.
The Guardian follows Ghost's nav point to a small room with an open door. A skeleton is laid bare across the floor in front of them. The Ghost scans it:
Alternatively, if the Guardian ignores the waypoint and continues even further into the vault, they will reach the final area--an enormous chasm with large platforms fading in and out of time. If the Guardian finds the final dead Ghost, another memory is recovered:
On the far side of the chasm, a timegate opens, its light visible even through the mist. A new set of platforms appear leading to it. They seem to appear and disappear even faster than the ones first encountered. The Guardian eventually makes it to the timegate and enters. The Guardian is warped to a distant point in time at the Glass Throne. Suddenly, Praedyth speaks again, without constraint and directly addressing the Guardian:
The Blighted Descendant is destroyed and the Throne cleared of Taken.
As a gift from Praedyth, the door at the Throne's entrance opens up. A chest in the chamber behind the door can be seen. Opening it earns the Guardian the Cult Ghost, a Ghost using the Intrusion Shell that once belonged to Praedyth.