fallout

Now you'll face the full might of the Mechanist, my righteous robots will end your tyranny once and for all!The Mechanist
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Restoring Order is a quest and achievement/trophy in the Fallout 4 add-on Automatron.

Quick walkthrough

Automatron main quest: Restoring Order 
Install the M-SAT on a robot. 
Travel to the RobCo Sales & Service Center
Fight your way to the Mechanist 
Collect the chief scientist's holotape, the facilities director's holotape, and the lead engineer's holotape to unlock the elevator. 
Confront the Mechanist. 
Kill the Mechanist and Sparks
Talk down the Mechanist as the Silver Shroud
Talk down the Mechanist. 
Reward: 300+ XP
Mechanist's armor and helmet
The Mechanist's lair as a settlement.
All robot mods unlocked. 
Leads to: Rogue Robot 

Detailed walkthrough

The Sole Survivor is tasked with finding and stopping the Mechanist once and for all, so head to the RobCo Sales & Service Center where The Mechanist's lair is hidden.

Once inside, the player character must use their robot with an attached M-SAT on several devices stuck to walls to open the blast-proof doors throughout the lair. After a lot of battling, the player character will finally make it into the Mechanist's war room. Inside, they will battle several waves of increasingly tough robots, the last one being a Duelbot. At one point, the Mechanist advises the player character that the fight is hopeless, because more robots can be created for every one defeated. Gradually, however, as announced by a machine-generated voice, and as more and more robots are defeated, the power consumption approaches maximum capacity and then the power fails.

Alternatively, the player character can collect all three supervisor holotapes and before going into the war room, the final battle with the waves of robots can be avoided. If going all the way back to near the beginning of the lair, where the first set of robots were fought, there is a decontamination corridor with a security room overlooking it. This room can be accessed either by a locked door on one side or a hole in the wall on the other. In this room is an elevator that is initially not working. Next to it on the wall is a Master-level locked "elevator access terminal" that can manually override the lockdown. After unlocking the terminal, then inserting each supervisor holotape and playing them, the three voice authorizations will override the lockdown and the elevator will work. At this point the player character can go up to the control room, surprise the Mechanist and a speech check will allow the player character to make the Mechanist stand down. (See notes below on where the holotapes are.)

Once the Duelbot has been defeated, the power will fail and a speech check will allow the player character to make the Mechanist stand down. The dialogue here is timed, so if one waits too long to speak with the Mechanist, she will turn hostile. After explaining herself, she will remove her helmet, revealing herself to be Isabel Cruz.

She will then thank the Sole Survivor, before giving them her costume and walking away. She will usually also give the side quest Rogue Robot. Ada will also thank the player character, at which point the main storyline of Automatron is complete.

Quest stages

Quest stages
StageStatusDescriptionLog Entry
400 Speak to AdaI discovered the Mechanist's lair has a hidden entrance in the old RobCo Sales and Service building. I should speak to Ada about my next move.
500 Install the M-SAT on a robotI need to use the robot workbench to install the M-SAT into a robot of my choice. Then I will be able to gain access to the Mechanist's lair.
600 Access the Mechanist's LairI installed an M-SAT on a robot. I will need to keep the robot with me as I venture through the Mechanist's lair to be able to access the doors.
700 Stop the MechanistNow that I've gained access to the hidden facility, I need to find a way to the Mechanist to put an end to the robots terrorizing the Commonwealth. Several doors will require a robot with an M-SAT installed, so I'll need to be sure to keep one by my side.
900 Take Control of the FacilityNow that I have the passcode, I should find the terminal that will allow me to take control of this facility and stop the production of these robots.
1000 Speak to AdaNow that the Mechanist has been stopped, I should let Ada know that it's over.
1100Quest finishedQuest complete

Companion reactions

EventCaitCodsworthCurieDanseDeaconHancockMacCreadyPiperPrestonStrongValentineX6-88LongfellowGage
Asking the Mechanist to talk face to face (down option)DislikesLikeLikeLikeLikeNo reactionNo reactionLikeLikeDislikesLikeDislikesNo reactionNo reaction
Telling the Mechanist that they're dead after persuading them to talkLoveHatesDislikesDislikesDislikesNo reactionLikeDislikesDislikesDislikesDislikesLikeNo reactionNo reaction
Telling the Mechanist that it's overLikeDislikesDislikesDislikesNo reactionNo reactionNo reactionDislikesNo reactionNo reactionDislikesNo reactionNo reactionNo reaction
Telling the Mechanist to stand downDislikesLoveLoveLikeLoveLikeLikeLoveLoveDislikesLoveDislikesNo reactionNo reaction
Telling the Mechanist that this only ends with violenceLikeHatesDislikesNo reactionNo reactionNo reactionLikeNo reactionNo reactionLoveNo reactionLikeNo reactionNo reaction

Notes

Bugs