All Collectibles in The Kar’Thul Marshes

Quick Links
DOOM: The Dark Ages gives players a lot more room to explore than past entries, and with that extra room comes a lot of secrets and collectibles to uncover.

Related
Doom: The Dark Ages: Every Weapon in the Game, Ranked
From Skullcrushers to the Super Shotgun, what firearms are the best in the Slayers arsenal?
There are a total of 5 secrets to find in the The Kar’Thul Marshes level of the game. Some are more well hidden than others, and we know where to find all of them.
Ruby
From the overlooking area, drop to the location on the map above and head into the cave. The floor will disappear below you, and you’ll have to solve the puzzle inside.
All you need to do is complete the Shield Throw alignment puzzle, then drop into the water and swim down. Land on the center platform and jump across to the Ruby.
Battle Knight Toy
The Battle Knight Toy is found in a small room at the location on the map, which is opened by hitting the overheated lock to the left of the door.
Gold Chest #1
Enter the giant tunnel near the back of the level and head through. The corner will never stop turning, so to find the end, you need to walk forward for a rotation, then turn around and head back to find the end of the tunnel. After breaking the chest the tunnel will stop curving.
Codex (The Witch)
Drop onto the lowered platform at the location on the map above, then look across the chasm.
Throw your shield to the blue Shield Switch, then quickly jump down to the encounter area and head through the gate leading to the Codex.
Life Sigil #3 + Gold Chest
Head into the giant tunnel on the map, and then use the Shield Switch to rotate the room in front of you.
Rotate the room so that the water is on the right-side wall, then swim up to the platform at the top of the right wall and jump over to the Life Sigil.
Drop onto the floating square platform, then use the Shield Switch from the other side to reveal the green Shield Jump point in the top square on the back wall. Jump into the hole to find the gold chest and the exit.
Wraithstone
In the location on the map above, there is a cave that leads to an underground temple with five glowing wolf altars inside. To unlock the Wraithstone in the center, you need to find and destroy the five wolf statues around the map.
To destroy the wolf statues, all you need to do is throw your shield at them. Their locations are listed below.
Wolf Statue #1
The first wolf statue can be found on a path to the right of one of the artifact locations. Look off the side of the cliff to the left to see the statue.
Wolf Statue #2
The next statue is located on a cliff above the entrance to the Ruby secret area.
Wolf Statue #3
The third wolf statue is hidden behind a pile of gold bars in the courtyard below the center spire (see map above for location).
Wolf Statue #4
The fourth statue is behind the giant tentacle enemy in the pond.
Wolf Statue #5
The final wolf statue is located inside the Wraithstone room, at the end of the hallway leading from the right of the altar.

Related
Doom: The Dark Ages: 10 Tips and Tricks We Wish We Had Known Sooner
Some secret features and pro-level strategies for your demon-slaying pleasure.