Mass Effect 3 Act 4 Guide: Task Checklist for Cerberus and Reapers
Act 4 is where Mass Effect 3 finally pushes the story into its climax—wrapping up not just the game, but the wider Mass Effect Trilogy’s long-running conflict. If you’re working through this late-game stretch, this part of the wiki guide focuses on Task Search and the checklist-style structure you’ll use to track what to do next.
Act 4: Setting up the finale
Once Shepard survives the end of their second multi-century war, they’re sent to the Asari homeworld of Thessia. The mission there is straightforward in description but massive in consequence: Shepard is searching for the Catalyst, the crucial piece needed for the Crucible to function. That objective immediately puts them on a collision path with Cerberus, since the group is tied to the broader scramble around the Crucible and its components.
From there, the assault on Cerberus’s headquarters becomes the turning point that kicks off the endgame. It’s framed as the start of the final phase of Shepard’s journey—one last push aimed at stopping the Reapers for good.
What to find in this guide section
If you’re trying to locate a specific resource quickly, the guide points readers to a set of related pages they can jump to for additional help.
- Legendary Edition Changes
- How-To Guides
- Key Choices and Consequences
- Romance Guide
- Walkthrough
- Side Missions
Next steps and key sections
Up Next: Priority: The Citadel 3
After Task Search and the Act 4 checklist content, the guide indicates what’s coming immediately next: Priority: The Citadel 3.
Top Guide Sections
You’ll also see a quick list of major sections that readers are typically expected to use alongside this part of the guide:
- Legendary Edition Changes
- Game Basics
- Tips and Tricks
- How-To Guides
Was this guide helpful?
The page includes a prompt for feedback, asking whether the guide helped you.
In This Guide
Finally, the guide section ends by signaling that more content follows under the “In This Guide” area, setting you up to continue deeper into the Act 4 checklist structure.
