Part 2: Strange Cave Optional

From Ostegoth, head north and slightly off the main path to the right to find the entrance to the 'Strange Cave' side-quest.

Drop into the cave, grab the chest opposite, and proceed north.

Pick up the 'gorehammer' weapon on the ground and climb the ramp.

Use the grenade launcher to clear the ice skeletons.

Work your way around the corner to the right and follow the passage up the ramp.

At the top, kill the appearing skeletons and ice stalker.

Continue forward, destroying ice skeleton champions, stalkers, and prowlers as they spawn.

Around the next corner, you'll find another 'gorehammer'.

Clear the room of prowlers and skeletons. Destroy the group of prowlers and a stalker that spawn as you approach the far end.

Head up the nearby ramp.

Fight the enemies directly in front before entering the next area.

Turn left and move forward slightly to engage stalkers and prowlers that spawn in the distance. Use your 'gorehammer' to defeat them.

Clear any remaining enemies. Watch for champions and prowlers dropping from the ledge on the right.

In the north of the room, check the alcove for a pair of chests.

Continue down the ramp to the south, defeating all champions and prowlers.

Follow the passage to the end, reaching a large open room.

In this large room, you will face a large number of enemies: approximately 5 ice giants and 50-60 ice skeletons. Keep a grenade launcher handy (a couple are available in the area if needed).

The strategy for this room is to cut large laps around the room using the grenade launcher to hit the pursuing enemies.

After defeating all enemies, a scene will play, and a new chest will spawn. Open it.

Step into the blue portal on the ground to return to Ostegoth.