Finding Tangled Grotto Walkthrough
Get through the hole which is to the left of the pedestal and move on. Destroy the enemies and find a new hole. You’ll spot a huge spider while going through it. When you get outside of it, eliminate the enemies and find another hole next to the eggs. This hole leads to a cave where you’ll have a fight with that spider. Remember to dodge and counterattack. Next, jump onto the train car and squeeze yourself through another hole. You’ll soon reach a dark subway tunnel. You don’t have to check the whole area, but you can actually find Demonic Artifact here. Then you need to get under the train at the very beginning of the railway. Jump down, kill the enemy and squeeze yourself through the hole on your left.
There will be two massive luminous bugs in the next room. They will be making small exploding bugs. If you kill them all and take the loot, you’ll be able to find a new artifact to level up your weapon — Unfocused Juggernaut. It increases physical damage which was done with your weapon and reduces Fury’s physical damage.
Come back to that tunnel with the train and go down the railway in the opposite direction. Follow the only possible way (through the train tunnel) until you find a new pedestal — Tangled Grotto.
Keep going; clear the corridors. Here you’ll find two passages with the purple stones but you can’t crush them right now. The alternative route is in the left side of the tunnel with a big staircase.
Secret: If you go in the opposite direction of it, you’ll see some smashed train cars on your left. Climb these cars, get through a hole and free one more human. There is also Demonic Artifact in this area.