Advanced Chemistry (choosing Amita) | Main Quests Far Cry 4 Guide

From a safe distance study the area and highlight the enemies.

Speak with Amita and get to the area that she will choose. Fill there your ammo and speak to the leader of the rebels to receive another quest. Use the opportunity to highlight all of your enemies. You should especially notice a jeep with an MMG that drives around the brickyard and the elephant that you may use to get rid of the enemies.

Turn off the generators

The first generator. Few steps behind it you will find a box with an alarm.

Try to stay hidden since if you will be detected then the enemy reinforcements will appear and they will make this mission a lot harder. At first go slightly down and deal with an isolated enemy nearby. Now you can deactivate the alarm. Now you may shoot to the elephant on the right side although the best moment to do so is when the hostile jeep is nearby. If you do so the elephant will probably eliminate the jeep from the further game.

The second generator and the last alarm. Beware of the battle dog which wanders in this area.

Make a use of the chaos which you have initiated and walk around the brickyard choosing the left side. On your way you will see a first generator which you need to deactivate. Behind it you may also find an alarm to turn off. Keep walking around the brickyard. Beware of the battle dog which wanders in this area. When you will deactivate both the generator and the alarm you may walk to a place which is close to the place you have come from. On your way you will pass the last generator which you need to deactivate as well.

Turning off the third generator will open the door to the heroin factory.

Now head to the door to the laboratory. When you are next to them beware of the two enemies which will exit from them. Now you can enter the brickyard.

Find the chemist

In the smoky rooms look around carefully since it's difficult to see the enemies.

Now you will have quite some fun. Turn left and then right next to the wall turn right. Open the door behind which you will see few enemies. You may deal with them with whatever weapon you want and if you will be in trouble just use a grenade. Notice that you will not see your health bar anymore although you need to keep healing yourself. Go further inside the factory and eliminate methodically all the enemies you will find. You need to get to the door in the room which is "luminescent" with a green glow. Behind this entrance your will find the chemist who is your target. Kill him and exit from the laboratory. And then... Kill the chemist few more times. Keep doing so until you will get the message according to which you need to leave the brickyard.

You may shoot your enemies from the distance. You don't have to worry about the ammo. Unlike your health bar.

Now you can really exit the room. Eliminate the incoming enemies using the guns which you have received. It should be an easy task. Remember to keep healing yourself from time to time. If you won't remember you can count on the reminder message from the game itself. These enemies will disappear after a single hit so if you will have to you can even save yourself with the melee fight. Getting to the end of the road and opening the exit door will complete this quest.