Follow the ramp leading downwards until you get a quick cut-scene introducing the Theron guards. Take cover and destroy him. Continue on until you reach a large ruin site. Here you will be attacked by a few drones, a flamethrower or two, a group of wretched and a gunship. Take all of the locust on the land out and then check out the top of the stairs in the centre of the area for collectible (1/1). Make your way through the ruins to the other side. Here you can destroy the gunboat by killing the drones on board, then shooting the yellow explosives on the deck.
Use the crashed gunboat to reach the next area and run forward into another ruin. Head to the right wall and take cover behind the collapsed pillar next to the stalactite ASAP as there are a few enemies already firing at you and this area will provide you with cover from three sides. Destroy the tickers first, then the drones and the kantus. The gunship will retreat and you can continue on unmolested for a little while. Continue through the area and you will come across an open area with several worn pillars on either side. At this point a blood mount will make its presence known.
Continue on to the final ruin in the area, head through either one of the arches and take out the drones and the kantus here. There are some tickers as well if you don't get rid of the kantus quick enough. Once you have cleared the ruin continue down the path and onto the dock. Run towards the end and a gunship will come along and drop off some troops for you to deal with. Kill them and continue to the end of the dock.
Following the cut-scene you will find yourself on a large, floating raft made up of the end of the dock you were standing on. A gunship will come up and immediately attack you. Kill everybody on board and it will retreat. As it does another gunship will come in to take its place. Repeat the process here; it will push you into a cave with yellow mist and glowing death fluid coming down the walls.
You will continue on here in piece for a little while until something hits the boat from below. Shortly thereafter a gunship will come up and try to ram you into a rock formation in the middle of the lake, kill the flamer and jump across the gap to hijack the gunship and continue on. Following the cut-scene a gunboat will come barreling in from the right, kill its crew. Soon after getting rid of this one, another couple will attack you from the left. Whilst you are dealing with these guys one more ship will get in front of you and fall back to your right.
As you finish off the baddies, you will enter a set of caves when you reach the end the chapter is complete.
