An unique and the most difficult of all trials. You are taken to a dark labirynth and have to find a way back. Start moving forward and follow the barely visible corridor. Continue by making your way to the next lit area. Once you've reached the grate, move backwards a little and turn right.
You'll soon reach an area where Senua nods that she has landed in a different area. Continue moving forward and follow the sound of a river stream. Once you've managed to reach the river, turn left and make your way upstream until you've reached an abandoned hut.
Use the stairs to go above, then jump below. You'll hear a strange animal. Turn right and skip the monster, then get past the door and continue forward. Start making your way to bonfires. Soon, your path will be crossed by monsters moving left and right - you can wait for a good moment and simply get past them by moving forward.
You'll encounter another house - go inside and use the beam to get to the other side. Jump into the well and follow Dillion. Watch out for scavenging monsters - avoid them and don't let yourself be captured. Reach the ghost to get the final fragment and complete the sequence.