Find all three Bellum Sempiternus Mission Dataslates in Warhammer 40,000: Space Marine 2. This guide details their locations, including the Effects of Warp Exposure, Burial, Adeptus Astartes, and Amount of Deceased on Demerium.
The Bellum Sempiternus mission in Warhammer 40,000: Space Marine 2 follows the boss battle against a Helbrute at the end of the preceding mission, Dawn's Descent. A key complication is that this mission cannot be started directly from the terminal in the Launch Bay. If any of the three Dataslates within Bellum Sempiternus are missed, players must replay Dawn's Descent and then the relevant portion of Bellum Sempiternus to find the overlooked collectible.
- 1Dataslate 01: Effects of Warp Exposure
After the mission begins, advance through the shattered landscape, past warp-addled Cadians. Drop down a pit and turn left. At a four-way intersection, turn right. At a second intersection, continue straight to a short dead-end branch containing a cowering Cadian. The Dataslate is on the floor near this Cadian. - 2Dataslate 02: Burial, Adeptus Astartes, Salamander Chapter
Progress through the level until you receive the objective "Advance to the Second Force," which involves reinforcing a company of Ultramarines. Continue until you reach a chamber to assemble with your squad, where a Multi-Melta and an Ammo Cache are available. Activate a terminal to open the door to a large circular chamber filled with Thousand Sons marines (including a Sorcerer) and Tzangors. After defeating them, exit the chamber through newly opened doors and descend stairs to find a sarcophagus. The Dataslate is located up the stairs beyond the sarcophagus. Turn left and search an altar to find the Dataslate resting atop it. - 3Dataslate 03: Amount of Deceased on Demerium
Exit the tomb containing the second Dataslate to begin the objective "Raise the Banner." Survive the scripted holdout until the Calgarvalry arrives. You will then be tasked with rotating "Control Units" to thwart a threat. After this, the objective "Advance to the Obelisk" will commence. Use a terminal to open doors, defeat Thousand Sons, and pass through an archway formed by warp crystals, purging any Tzangors beyond. Exit back outside, ascend stairs, and pass through a second warp crystal doorway. You will know you are in the correct area when the secondary squad completes their objectives, triggering dialogue between Titus and Straban. In the ruins beyond this second warp crystal doorway, you will find a conventional gate with its portcullis raised. A Thunderhammer is located to the left. The Dataslate is found by going around some rubble to the right, where it rests on the ground near the corpse of a Tech-Priest.
- It is highly recommended to use a guide for this mission, as missing any Dataslates requires replaying the previous mission, Dawn's Descent, and then a portion of Bellum Sempiternus.
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