Mystery in the Building Main Mission Guide
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Mystery in the Building is a Main Mission in the Path of Ascension quest series of Arknights: Endfield. Check out how to unlock this mission, its walkthrough, and all its rewards in this guide!
| Previous Mission | Next Mission |
|---|---|
| Walk in the Park | Down the Hill |
List of Contents
Mystery in the Building Quest Information
Mystery in the Building Quest Details
| Mission Type | Main Mission |
|---|---|
| Quest Line | Path of Ascension |
| Chapter | Chapter 1 - Process 3 |
| Location | Valley IV, Originium Science Park |
Mystery in the Building is the fifth quest under the Path of Ascension mission series. This quest is under Chapter 1 - Process 3 of the main story and is located in Originium Science Park.
How to Unlock Mystery in the Building
Mystery in the Building is immediately unlocked after completing the Walk in the Park quest and has no level restrictions.
Mystery in the Building Walkthrough
Mystery in the Building Quest Guide
- Reach 2F of the Research Center
- Go to Yvonne's Lab
- Defeat the Anomalous Landbreakers
- Open the Lab Door
- Pick a Vinyl for Yvonne
- Look for Yvonne's Other Vinyls
- Go to the Repair Platform
- Defeat Anomalous Landbreakers
- Continue to the Repair Platform
- Repair Tata
- Defend Tata
Reach 2F of the Research Center
Go to the room with red lights and call the elevator. Defeat the Anomalous Landbreakers while waiting for the elevator. Ride the elevator to 2F and defeat more Landbreakers as you step out.
Go to Yvonne's Lab
Proceed to the room to the right and defeat more Landbreakers. Open the door and see that the direct path to the lab is blocked. Find another way through by going straight to another room with moving platforms.
Use the platforms to move to the next area. Jump up the crates and wait for the moving platform to take you to the other side. Turn left and ride the second moving platform to go to the next room. Follow the path and jump down to more Anomalous Landbreakers.
Defeat the Anomalous Landbreakers
Jump down to the room outside Yvonne's lab and defeat 5 Anomalous Landbreakers before entering the lab.
Open the Lab Door
Open the lab door to finally reach Yvonne's lab. Everyone else catches up with Yvonne. She is finishing up repairs and asks you to play her favorite music for her.
Pick a Vinyl for Yvonne
To the left of the room is a set of vinyl records you can choose from. The first choice is a retro style record, while the other is a brand new record. Both records does not satisfy Yvonne.
Look for Yvonne's Other Vinyls
To the other side of the room is another vinyl record that fits more of Yvonne's style. Play the Vinyl Again. This motivates her even more in calibrating the power output.
Go to the Repair Platform
Yvonne will now lead the way for us to the repair platform. Open the door to go to the next room with Landbreakers.
Defeat Anomalous Landbreakers
Defeat 5 Anomalous Landbreakers that block your path to the repair platform.
Continue to the Repair Platform
Approach to open the door to reunite with Tata at the repair platform.
Repair Tata
Yvonne is ecstatic to be reunited with the Prototype. Meanwhile, a huge mob of Landbreakers lurk towards you. Chen blocks an arrow fired at the gang. Prepare to defend the repair platform.
Defend Tata
Defend Tata while Yvonne tends to fix it. These enemies will come in waves. After the third wave, Yvonne assists in the fight by dropping air bombs. The final wave is the Bonekrusher Ballista. Defeat the final wave and Yvonne will finish the repairs to Tata.
Mystery in the Building Quest Rewards
Total Item Rewards
| Total Quest Rewards |
 T-Creds x11000 |
 Protoprism x16 |
 Origeometry x4 |
|---|---|---|
 Basic Expansion Core x1 |
 Arms INSP Kit x27 |
|
You can also get 700 Operational EXP and 200 Valley Regional Development Metric for completing the quest.
Arknights: Endfield Related Guides
All Main Chapters and Processes
| Prologue | |
|---|---|
| Process: Awakening | |
| Chapter I: Process I - The Broken Lands | |
| Break the Siege | Valley Reboot |
| Rally and Unite | Westward into the Vale |
| Secure Sanctuary | Building an Outpost |
| Through the Haze | Fort Showdown |
| Chapter I: Process II - The Turbid Heavens | |
| Paving the Way | Work Preparation |
| Maintenance Progress | - |
| Chapter I: Process III - Path of Ascension | |
| The Mission Continues | Cross the Science Park |
| Park Way Party | Walk in the Park |
| Mystery in the Building | Down the Hill |
| Shattered Veins | Lodespring Crossing |
| Cradle of Ages | Eve of Battle |
| Chapter I: Process IV - Smoking Embers | |
| Entering the Endgame | Counterstrike Brewing |
| Scaldings of Utjug | Frontline Rush |
| Undying Cinders | Temporary Peace |
| Mysterious Signal | Conference of the Four |
| Work Preparation | - |
| Chapter II: Process I - Lost in the Marsh | |
| Arrival at Wuling | Stumbling Into Qingbo Stockade |
| Destination Wuling | - |
| Chapter II: Process II - The Way of Water | |
| A Glance of Astonishment | A Breeze Away |
| Of Grace and Gentle Might | - |
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