From Destinypedia, the Destiny wiki
Queen Mara Sov granted access to the Caliburn Gatehouse to the Young Wolf in order for them to access the Dozmary Vault where Ager's Scepter was being kept. In order to align the gate within the Gatehouse to the vault, the Young Wolf had to collect four sets of Atlas Skews to complete the star chart. Each set of skews also unlocked a recording left behind by Prince Uldren Sov reflecting on the nature of his relationship with Mara.
List of appearances