In God of War Ragnarok, What Lies Below is a boon side quest that takes place in the Jungle, a hidden region within The Crater hidden region in the realm of Vanaheim. You can get to the crater by completing the Scent of Survival side quest, which begins after completing the Creatures of Prophecy objective in The Path’s main story quest line. Then you can reach The Jungle by driving south from The Plains (the first region of The Crater you visit) at night.
Related: How to defeat the Dreki in God of War Ragnarok
How to start What Lies Below
What Lies Below will begin during the Return of the River side quest Favor when you reach the top of the dam and squeeze through the wall to its west side. There you will see a Dreki chasing the local wildlife, and Atreus will point out that such an overpowering predator will be bad for the balance of the local ecosystem. This will start the What Lies Below quest, but you won’t be able to track the Dreki just yet.
How to find a path to the Dreki
The Dreki is in its feeding ground west of the dam, but you can’t reach it yet because the water is too deep. So, to lower the water level on the west side of the dam, you need to continue the Return of the River Favor side quest by opening the dam. This not only raises the water level throughout the crater, but also lowers the water level on the west side of the dam.
Once you’ve opened the dam, jump to the platform at the south end (near the ghost) and throw your Draupnir spear at the hole in the ruin to the north. Now swing your spear across the gap to the west and climb over the ruins. On the other side, drop down to face not one, but two Dreki.
How to defeat the two Dreki
Focus on defeating one of the Dreki first. It doesn’t matter which one, it’s just that the fight becomes a lot easier when there’s only one left to deal with. The Dreki use many long-range attacks that are difficult to dodge, so better parry your shield when you see the yellow circles. The unblockable attacks are area abilities that are also difficult to dodge, but if you see the red circles, roll away as far as you can as fast as you can. Otherwise, just use all your rune and rage skills and have no mercy.
https://www.gamepur.com/guides/how-to-complete-what-lies-below-in-god-of-war-ragnarok How to complete What Lies Below in God of War Ragnarok