Talk to Ikora

Speak to Ikora Rey in the Hall of Guardians at the Tower.
"The Vault of Glass is unique in all of the solar system. My scans indicate that other realities brush up against our own within the confines of the vault. So maybe you could even say it's unique in all the universes? The Vex are confusing." —Ghost
Added In
The Taken King (2015.09.09)