Destiny 2: Lightfall’s Season of Defiance introduced the new Vexcalibur Exotic glaive through a secret//NODE.OVRD.AVALON// Exotic mission.

After you complete the mission, head back to the HELM to grab your reward.

However, there are still other mysteries left to solve.

The first data node for Aberrant Subject mystery.

Then, jump onto the higher platform with another green data node.

Activating the second node frees the trapped Hobgoblin and completes the Data Retrieval: Aberrant Subject Triumph.

When you land on that platform, look up to shoot the first red-colored Override Node with Vexcalibur.

The second data node for the Aberrant Subject mystery.

The second Override Node is directly below, floating next to the platform.

Carefully jump down to a lower ledge and shoot at the Override Node.

Grabbing the three Override Nodes spawns a chest and completes the Data Retrieval: Cannonball Triumph.

How to start the Data Retrieval: Disposal Subject puzzle

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First Override Node in the Vexcalibur Exotic mission.

The second Override Node is next to the platform.

The third Override Node is inside the platform’s cavity.