Mystery in the Building is the 17th main mission in Arknights Endfield. This walkthrough will guide you through all objectives of the Mystery in the Building main quest.
- Starting Location: Originium Science Park
- Quest Giver: Automatically begins after completing “Walk in the Park“
- Chapter: 1 – Process 3
- Requirement: Complete Main Mission 16 – Walk in the Park
- Reward: Origeometry x4, T-Creds x11,000, Intermediate Combat Record x34, Protoprism x16, Arms INSP Kit x27, Basic Expansion Core x1, Valley Regional Development Metric x200, EXP x700
- Quest Description: You must head to a lab on 2F of the Research Center and find Yvonne.
Reach 2F of the Research Center
There are two ways to go. To the left is a Crisis fight you can take on. This is a really hard challenge at this point, since you can only level up your characters so far at this point.
Head right into the next room and then turn immediately right to call the elevator.
Three Landbreakers attack you. Since you cannot interact with objects while in combat, take out the Landbreakers.
Once they’re disposed of, head into the elevator and use it to reach the second floor.
Go to Yvonne’s lab
When the elevator opens, several other Landbreakers attack you. Take them out if you wish. With that said, you can just go right into the next room and avoid them. They do not leave the room they start in.
After that, turn left into the next room. You need to defeat the enemies in this room in order to proceed.
When finished with them, open the lab door using the control panel. Head inside to trigger a cutscene.
Find another way through
Look just in front of you to your left to find an Aurylene. Grab that, then continue forward into the next room.
Go to Yvonne’s lab
In the next room, turn left to see a bit of platforming.
Climb up the boxes on your immediate left. Then, ride the platform to the right and up to the next area.
Step off the platform, then head left along the wall to the next platform. Ride that across the gap to reach the next room.
Here is a more straightforward platforming sequence. Grab the Gather point on the ground ahead of you before heading upward.
Run along these rafters, taking out the two enemies you come across.
At the end of the path, drop down and grab the Gather point on your right.
Defeat the Anomalous Landbreakers
Then, head left and drop down into the next room.
Defeat the Landbreakers waiting for you there.
Open the lab door
Interact with the control panel to the right of the door. This triggers a cutscene.
Pick a vinyl for Yvonne
When you regain control, head to the vinyl player. This prompts you with a dialogue option, but neither of them is what Yvonne wants. Try both options to progress.
Look for Yvonne’s other vinyls
Cross the room behind you and interact with a box of vinyl records.
Play the vinyl again
Head back to the vinyl player to trigger a cutscene.
This cutscene eventually leads to a dialogue choice:
- [Alrighty. Lead the way] – You must select this dialogue choice in order to progress the quest.
- [Hold on. I need to get prepared]
Go to the repair platform.
Follow Yvonne to the control panel and interact with it.
Defeat the Anomalous Landbreakers
Step inside the opened door and defeat the 5 Anomalous Landbreakers.
Go to the repair platform
Interact with the control panel to open the door.
Step outside to trigger a cutscene.
Defend Tata
This cutscene leads you into an ambush. Defeat the Landbreakers that try to attack Tata.
There are 3 waves of enemies. The first wave has 5, the second has 3, and the third has 4.
Another three more rounds come in after that, but Yvonne’s gadgets take them out for you. Another cutscene starts after these three rounds.
Finally, you face Bonekrusher Ballista.
Note: If you end up dying in this fight, you revive immediately inside the last door you opened. Your entire team also revives and heals to full. So, feel free to die in this fight if you need to revive your characters. If you use this tactic, you will need to redo this entire fight, including the 6 waves of enemies before the Bonekrusher Ballista. Keep that in mind.
Bonekrusher Ballista uses a crossbow to shoot arrows at you as well as shoots barrages into the air that fall on you. Stay out of any red circles that appear on the field.
The worst of his attacks is a series where he charges up, then leaps at you and slams down. Immediately after that, he charges another attack, an attack that you can counter. Be ready to hit him with a skill because the counter window is quite small. He repeats this quite often, so you get plenty of practice dealing with his routine. Use your skills to take out the Bonekrusher Ballista.
This finishes Mystery in the Building main quest in Arknights Endfield.
NEXT: Down the Hill
For all other Quests refer to Arknights Endfield Walkthrough.
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