Follow Khan to find the Dark One | Chapter 21: Khan Metro: LL Guide
Last update: 11 May 2016
This chapter is very linear. Follow Khan and take the door to the right that has been opened by one of your allies. After you reach a tunnel with large fans in it, wait for Khan to stop the first one and proceed on. Stop at the second one and let Khan stop it.
Stop for a moment where Khan jumps down to a lower ledge. Do not hurry with doing the same and examine the passage to the right shown in screenshot 1. This way, you will get to a corpse with military-grade rounds on it, and an Artyom's diary page shown in screenshot 2.
Only then return to the previous area and resume your walk. Be careful in the area with the destroyed staircase, and make sure that you do not lose your balance and fall.
Soon, you will reach an area where you will have to fight a small group of mutants. Of course, the best way to get rid of them is with the double-barreled shotgun or the shotgun but, if you have the maximum permissible amount of grenades you can use several of them also, to ensure victory.
After you are done with the monsters, spend some time and explore this area to find an interactive gate to a corpse with the military-grade rounds on it. Return to Khan and go straight ahead, and eliminate one more mutant on your way. Crouch mow and jump down into the tunnel below.
After you get into an area with no visible way out, act in accordance with Khans orders and start setting cobwebs on fire. Fortunately, instead of wasting precious incendiary grenades, you can easily make use of your lighter. Keep on setting the cobwebs on fire, until you unblock the passage shown in the above screenshot.
Remove a few more cobwebs, so as to ensure safe passage to the partially flooded area. Do not hide the lighter yet, because soon you won't be able to make use of your torchlight and the night vision goggles. Follow Khan and answer the phone on your way.
The next stop is the cave with waterfalls. Soon, you will be transferred to a new area, where you will be taking part in a vision of some sort. For the next few moments you won't have to do anything in particular.
You will regain full control of Artyom only after you reach a place that resembles the den of the Dark Ones that you have seen at the beginning of the game. Follow Khan into the area where you previously caught up with the fleeing Dark One.
After the vision ends, start running after Khan and do not worry about the flames that appear around you. After you reach the train's last car, you will watch yet another cutscene.