Sell any junk you have to Ostegoth and then continue to the north. If you go slightly up the path to the north, you can check out the small area to the right here for a new side-quest – ‘ Strange Cave ’. This quest is entirely optional, but will take all of 10-15 minutes to complete, so let’s knock it over now.
Drop down into the cave below. Grab the chest opposite and then make your way north. Pick up the weapon on the ground – gorehammer and then climb the ramp.
Using the grenade launcher, clear out the ice skeletons here and work your way around the corner to the right. Follow the passage along and up the ramp. At the top, kill the skeletons and the ice stalker that appear. Afterwards, continue forward, destroying the ice skeleton champions, stalkers and prowlers as they appear.
Around the next corner, you will find another gorehammer, so if you neglected to pick it up the first time, now might be a good opportunity to do so. Clear the room of prowlers and skeletons. As you approach the far end, another group of prowlers and a stalker will spawn, so destroy them before again heading up the nearby ramp.
At the top, fight off the enemies directly in front before entering. Once inside turn to the left and move forward slightly to see a couple of stalkers and prowlers spawn in the distance. Use your gorehammer to take them down before they get close enough to do too much damage.
Clear out any remaining enemies, and watch for additional champions and prowlers that drop down from the ledge on the right and when it’s all clear, check the alcove in the north of the room for a pair of chests.
Continue down the ramp to the south, killing all the champions and prowlers here. Follow the passage all the way to the end until you reach a large open room.
The trick to this room is to cut giant laps around the room using the grenade launcher to smash the baddies that chase you around. It shouldn't take too long and is easy enough.
After killing everything, a scene will play showing a new chest spawning. Open that and then step into the blue portal on the ground to return to Osetgoth.