Doom Slayer’s search for Thira continues in Chapter 16, The Kar’Thul Marshes of Doom The Dark Ages. Here’s a complete walkthrough.

After the events of Chapter 15, the Doom Slayer finds himself in The Kar’Thul Marshes in Doom The Dark Ages. In the previous chapter, we saw our protagonist going through the City of Ry’uul to unlock the portal, which has brought him into Chapter 16. His search for Commander Thira still continues, and he does not intend to slow down. This level is similar to its predecessor; it is filled with demons, puzzles, and platforming areas. Let us walk you through it.
The Kar’Thul Marshes Full Chapter Walkthrough in Doom The Dark Ages
Collect the First Relic

After exiting the portal, players will find themselves in the lands of The Kar’Thul Marshes in Chapter 16. Your first objective here will be to collect two Relic Fragments. Both of them will be marked, so you won’t have trouble finding them. Go towards the left to find the first relic. There you will find a breakable statue. Move past it and then go down to the platform below. There, fight and defeat the enemies to move forward.
Keep moving towards the relic marker, and you will find yourself soon in another battle; however, this time, you will have to face a demon leader as well. After clearing the area, collect the relic from the black orb. With one relic in the bag, it is time to gather the other one.
Collect the Second Relic

Take the path to the right of the orb to reach the second point of interest. But be careful, because you will meet two more arenas with enemies on your way. After the second area, you will notice that your paths are blocked. In this scenario, take the open road to the far left of the place, and you will find yourself in the relic area but swarmed with demons. Just like the first arena, this one will feature a demon leader as well. After defeating every enemy, collect the second relic from the black orb to complete the first objective.
Now, a new area will be unlocked, and you will have a new objective: to assemble the Relic Key. The entire level of Kar’Thul Marshes is quite open and simple, so you won’t have to do much platforming. You can simply walk towards the quest marker to reach the point of interest. However, this is a Doom title after all, so yes, you will get to kill more enemies on your way to the next location. Additionally, you can also open the map to see where you need to go.
Assemble the Relic Key

Once you reach the building of the objective, you will see some vines blocking your way. Aim at the green circle and smash through it with your shield to move forward. Inside the area, you will find a Sentinel Shrine, so you can upgrade your weapons or shield if you want. Once you are done, go straight to the quest marker and interact with the structure there to assemble the Relic Key. Doing so will open the large gate in front of you. Go through it and swim to the other side.
Then, keep walking and you will enter a room with a flying rock with engravings on it floating in the middle. Get rid of the demons in the area and then go to the stone panel at the far end of the room. It will take the Relic Key from you and open a portal when you interact with it. Going through the portal will mark the end of Doom The Dark Ages Chapter 16, The Kar’Thul Marshes.

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