Blind Betrayal

Blind Betrayal is a quest and achievement/trophy in Fallout 4.

Quick walkthrough

 * 1) Speak to Elder Maxson
 * 2) Speak to Proctor Quinlan
 * 3) Follow Scribe Haylen
 * 4) Speak to Scribe Haylen
 * 5) Travel to Listening Post Bravo
 * 6) Locate Paladin Danse
 * 7) Speak to Paladin Danse
 * 8) AND/OR Execute Paladin Danse
 * 9) Retrieve Paladin Danse’s Holotags
 * 10) Watch Danse’s Execution
 * 11) Speak to Elder Maxson
 * 12) Return to the Prydwen
 * 13) Speak to Elder Maxson

Detailed walkthrough
Spoilers Ahead!!!

The quest "Blind Betrayal" is given to the player after other quests are completed. I was given the quest after the completion "Liberty reprimed" your experience may vary. The quest starts when the player visit Elder Maxon and he questions you for answers of being a traitor. Elder Maxon informs the player that the data they retrieved from the institute from the quest "Outside the wire" that was given to Elder Maxon by proctor quinlan revealed that Paladin Danse has a perfect DNA match for a synth called M7-91. Elder Maxon then tells the player that Paladin Danse has went AWOL and further enforces their conclusion that M7-91 and Paladin Danse are the same. Elder Maxon then asks the player if Paladin Danse has sworn him to secrecy. The player is given four choices that depend on the players charisma level.

(I played around with this changing my charisma to 2 from 7 and gained the same results which leads me to believe that all results are the same.)

After the dialogue, the player is told to see proctor Quinlan about finding Paladin Danse and taking care of him. While talking to Protor Quinlan, scribe Haylen interrupts and later reveals that she has information on her air ship that may help the player in locating Paladin Danse. Scribe Haylen leads a player away and pleas to give paladin Danse a second chance explains his side of the story. She then tells the player that if the police station had been lost their fallback plan was to retreat to "Listening Post Bravo" an old military base that may have clues to where Paladin Danse is located.

Upon arrival to Listening Post Bravo the player is attacked by two machine gun sentry's located on top of the bunker. After entering the bunker a locked door can be found to the left with supplies and a corpse of a slain protector beside the desk. A terminal at the end of room that is used to activate the elevator. After leaving the elevator the player is attacked by two protectors and a machine gun sentry. Once the player has defeated the enemies Paladin Danse is seen on the other side of a window naked, using a broken path to the right the player is then able to talk to him. The player then gains the choice to execute or refuse to execute Paladin Danse.

If the player executes Paladin Danse, the quest updates to retrieve Paladin Danse's dogtags. Paladin Danse's body also carries any other items that the player has traded to Paladin Danse while traveling with him. The player then reports to Elder Maxon who then promotes the player to Paladin ranking. Elder Maxon then gives the player, Paladin Danse's living quarters and completes the quest. Paladin Danse's living quarters can be found to the left upon entering the main deck. The player is also given Paladin Danse's power armor, which is located down the hall in the main deck past the cafeteria to the right, opposite side of where the player is given their own power armor. Guards will also comment on how hard it was for the player to kill Paladin Danse and how the player earned his new ranking. Scribe Haylen will give the player a cold look and refuse to talk.

(I tried following Scribe Haylen around and trying to make her talk to confirm this but she would not say anything, further testing required)

If the Player refuses to execute Paladin Danse, he must convince him to live. Once the player is successful then Paladin Danse will give the player his dogtags for proof to Elder Maxon and tells the player he must cross the border and leave Commonwealth. Upon leaving the bunker the player is met by Elder Maxon who then tells the player he must kill Danse or he will do it himself.

If the player convinces Elder Maxon that Paladin Danse is not a traitor and should live, Elder Maxon will tell Paladin Danse that he is an enemy of the brotherhood and will not be allowed to set foot on any brotherhood owned grounds or he will he killed on site or associate with any members of them. Paladin Danse will then stay at the bunker. Once the player returns to the ship the player is given the same rewards if he had killed Paladin Danse and completes the quest. If the player returns to the bunker where Paladin Danse is, he is able to find supplies and a bed, If the player asks Paladin Danse to become his companion the player is then considered an enemy to the brotherhood of steel which will kill the player on sight only when Paladin Danse is following.

If the player fails to convince Elder Maxon, the player will be given the choice again to execute Paladin Danse or have Elder Maxon do it himself. If the player chooses to refuse and have Elder Maxon execute him, Elder Maxon tells the player he is disappointed in him/her and will see him back at the ship. Once the player returns to the ship the player is given the same rewards if he had killed Danse first and completes the quest.

Rewards: The fate the Paladin Danse, a room on the Prydwen with a bed, and storage containers and a full suit of Model D, BOS-V-T-60d Power armor.

Bugs

 * Once Elder Maxson arrives in the vertibird after exiting the listening post, he may start walking off into the distance making it very difficult to enter dialogue with him. One potential fix is to continually step in front of him and prevent him from moving too far away from Danse allowing Danse to be spared or executed by Maxson. If he does get away, the quest can be completed by executing Danse yourself and finding Maxson to the north and briefly talking to him to return him to his quarters.


 * Upon completion Danse's power armour is found on the closest rack to your right when entering. But if the player loads a quicksave directly after going onto the main deck the armour will dissapear.