Fall of Atreus Operation Dataslates

Begin the mission by progressing through ruins, mines, and archeological sites, engaging Thousand Sons enemies.

Eventually, you will rendezvous with a Dreadnought and begin the objective "Follow the Dreadnought".

Part ways with the Dreadnought when it holds open a door for you.

Enter the ruins and interact with a terminal to begin the "Clear the Passage" objective, which involves a holdout segment.

Defend the area while a crane lifts debris. You will need to activate two generators midway through this objective.

After the crane clears the hole, drop down onto some crates, then drop again into a chamber.

Dispatch any Thousand Sons enemies in this chamber.

Circle around behind the stacked crates you fell on to find Dataslate 01: Unauthorized Override Attempt on the ground near the corpse of a Tech-Priest. This chamber contains a weapon loadout pod and is hard to miss.

Warning: Do not drop down another hole until you have collected Dataslate 01, as doing so before collecting it will require you to replay the mission.

After collecting Dataslate 01, drop down the next hole to enter some mines.

Fight your way through the mines, dealing with Thousand Sons enemies, until you reach a large excavation chamber containing a multi-level mining rig.

Ascend the mining rig by going up two concrete ramps, followed by three metal ramps.

After the third metal ramp, turn left and go around a corner to find Dataslate 02: Status: Battle Barge, Sword of Atreus on some crates.

Warning: Do not use the terminal at the top of the mining rig to open doors until you have collected Dataslate 02. Crossing through these doors before collecting the Dataslate means you will miss your chance to obtain it.

After collecting Dataslate 02, ascend the mining rig further and use the terminal to open a door. Beyond this door, you will be reunited with the Dreadnought. If you reach the Mechanicus Compound, you have gone too far.