Chapter 3 features an epic mecha-type battle, and here is the complete walkthrough of DOOM The Dark Ages Chapter 3 Barrier Core.

While completing Chapter 2 of DOOM The Dark Ages, a brief cutscene reveals a glimpse of Atlan. As expected, the Chapter 3 Barrier Core is entirely centred around Atlan gameplay. Although Chapter 3 is relatively shorter than the previous ones, it stands out from them due to its ultimate and intense mecha-type battles.
The chapter starts with the cutscene featuring the DOOM Slayer pairing himself with the Atlan and preparing for the epic battle. In this DOOM The Dark Ages guide, we will go through the complete walkthrough of Chapter 3 Barrier Core, explaining the events and the plot.
Related: All Doom Games in Chronological Order (With Doom: The Dark Ages)
Barrier Core Full Chapter Walkthrough in DOOM The Dark Ages
Learning the Combos and Finishers

After the suit-up preparation sequence, you start the mission inside the Atlan, continuing where you left off in Chapter 2. Dash through the initial barriers to get out of the Hangar. While you’re heading to the Barrier, you will encounter titans. You will learn the basic Atlan combat, including the combos, Rocket Punch, and the different finishers like the Stomp finisher and the Palm strike finisher. After learning the Perfect Dodge mechanics, dodge three times right before an attack lands on you to progress the mission.
Getting to the Power Core

After completing the basic tutorial, head to the Power Core. As you progress towards the objective marker, you will find yourself blocked by a barrier. Destroy the barrier to witness King Novik battling another Titan piloting his Altan. He also commands his soldiers to deploy a weapon pod, which contains a giant mini-gun-type weapon. Make your way to the core by defeating titans using the Supercharge mechanic, which enhances your weapon after a Perfect Dodge. As you reach the Power Core, interact with it to extract the unstable energy core.
Evacuating the Core

King Novik warns that the core will explode in no time. Commander Thia then guides you through a strip mine to evacuate it safely. While you attempt to move the core away from the city, you are ambushed by a special titan equipped with a shield and wearing armor. Attacking the titan removes its armor, allowing you to finish it off.
It ends the chapter with a spectacular cutscene where the DOOM Slayer squeezes the core into the titan’s mouth and kicks it towards the strip mine, triggering a massive explosion. The end cutscene reveals that Prince Ahzrak learns from Deag Loric that the Heart of Argent is sealed in a chamber.
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