Part 21

Engage the Angry Titan (A36), which is a boss fight against the Corpser.

After defeating the Corpser, proceed through the path where Cole and Baird appeared; the area will seal behind you, leading to a checkpoint (an auto-save point you restart from on death) and the next chapter.

The Corpser attempts to crush you by stomping with its nearest leg. Stand by a leg and wait for it to raise.

Run away from the raised leg and shoot its stomach. Blind firing may be effective.

After it screams, shoot its neck (not its chin, chest, or head).

It will roar and back up. Repeat this process three times until it is backed up as far as possible onto a platform.

While still standing on the rock (not the platform), shoot the two small hedges on each side of the platform to break them.

The Corpser will fall into the Immulsion, completing the task.

INSANE NOTES: Beat the Corpser quickly to prevent Wretches from appearing.

Proceed to Tip of the Iceberg (A37), the end of Act 3.

Be prepared for Theron Guards, who have a height, accuracy, and one-hit-kill advantage.

You will encounter a Point of Interest: the Torque Bow. It is advised against using it in single-player, but you may pick it up if it's your first playthrough.

Marcus plans for himself and Dom to go straight into the pumping station while Cole and Baird flank right. It is advised against going straight into the pumping station.

Take the right path instead. Continue until Dom hears a sound, likely near a chipped L-shaped wall.

Take cover (press the cover button to crouch behind walls or objects) at the L-shaped wall and equip your Longshot.

When Marcus says, "Let's clear that station!", begin sniping enemies. This is easier than the intended path.

If it is your first time playing on Casual, you may take the left path. On harder difficulties, the right path with the Longshot is recommended.

If you do not have the Longshot, you will have to go up to the platform and pray.

Once enemies stop coming, head towards where Cole and Baird likely are and go up the ramp.

Take cover and carefully make your way around the platform, eliminating all enemies.

After clearing the platform, head down the ramp and continue straight.

Look for a green button on the right side of the path and press it.

Two more Acts remain.

INSANE NOTES: The Longshot is crucial for this segment on Insane difficulty. Without it, you must enter directly and pick off enemies meticulously. Theron Guards are dangerous with the Torque Bow, which is a one-shot kill. If you hear the Torque Bow charging or see its glowing sight, stay in cover.

Proceed to Act 4 (A4) and the Ashes Overview (A41).

Your objective is to go to Marcus's house.

Theron Guards are prevalent in this chapter and may seem easier but should not be underestimated.

You will fight a Berserker before reaching Marcus's house.

The final thirty seconds of this Act will be intense.

Begin Campus Grinder (A42) by heading up and to the left, taking cover.

Use the Longshot to eliminate as many enemies as possible.