Cornerstone

Overview

Cornerstone is a Legendary quest from Season of Dawn that unlocks the Tower Obelisk. It is started by Saint-14 in the Tower hangar. The quest is one of the main reasons to visit Saint-14, who is found to the left of the spawn point in the hangar.

Walkthrough

1. From One Brother to Another: Speak with Saint-14 to help repair a device Osiris left him.
2. Some Assembly Required: Collect 10 Crucial Components each from Fallen, Cabal and Vex enemies. Components drop from enemies with an orange bar or higher. Public events are an efficient way to gather them.
3. Parts and Labor: Return to Saint-14 in the Tower hangar.
4. Delivery Pending: Place the repaired obelisk in the Tower Courtyard.
5. Synchronized Resonance: Approach the obelisk in the Tower Courtyard to activate it.

Rewards

The Tower Obelisk. In guides from the season, the obelisk lets players manage their other Obelisks from one place, and its synchronization bounties link the Tower to the other destinations. Some guides describe a synchronization glitch at the time, so check current patch notes.