Servant of the Machine Mission Dataslates Space Marine 2

You'll start by fighting through waves of Tyranids alongside some Astra Militarum buddies. After you've secured that area, you'll head into a building. Inside, you'll need to take down a Ravener. Once that's done, hop on the elevator and ride it up. When you get off, immediately turn left and keep going around the back of the elevator structure. You'll find the first Dataslate lying on the ground near a corpse. Heads up: If you accidentally fall down the pit that leads to the Neurothrope boss fight area, you'll miss this Dataslate and have to restart the mission to grab it.

After you've dealt with the Neurothrope boss and fought off a few more Tyranids, you'll trigger a scene introducing the Thousand Sons. Clear out the initial wave of these heretical Astartes. Things get interesting when Chairon decides to go on a solo rampage – your job here is to provide covering fire from a distance. After you've cleared out the Heretic Astartes and their goons, you'll need to destroy an altar to open the path forward. After a quick resupply, make your way across a bridge. This is one of the rare sniping sections in the game, so take a moment to enjoy picking off the Thousand Sons attacking Chairon.

Once all the Thousand Sons are down, you'll get a cutscene where you reunite with Chairon. After this, you'll be checkpointed to the final big set piece of the mission. When you spawn in, head down a slope. You'll see stairs to your left – ignore those and keep pushing forward through some rubble. Look to your left again, and you'll find the second Dataslate sitting on a crate, right next to another corpse. Can't have a Dataslate without a fallen comrade, right?