Synth Retention

Synth Retention is a quest that can be obtained in the Commonwealth in Fallout 4.

Synopsis
Having infiltrated the mysterious and illusive Institute, the Sole Survivor will finally be given the chance to learn more about this faction, its leaders, and ultimately, their goals.

Walkthrough

 * 1) Speaking with Father, it is revealed that a rogue synth had undergone a memory wipe, instigated by The Railroad, and has now begun terrorizing the Commonwealth in his new personality, as a ruthless raider leader in command of the raider town of Libertalia.
 * 2) Upon arrival at the Nahant township, the Sole Survivor will need to team up with an Institute courser under the designation X6-88, the same courser seen in Kellogg's memories, who will help cleanse the raider town of all life.
 * 3) After making it onto the upturned cruise ship (beware the raider utilizing a Fat Man, who is overseeing the elevator leading up onto the ship), serving as the town's command center, the party will need to fight their way upwards, until finally reaching the captain, the rogue synth, Gabriel, and two raider lieutenants.
 * 4) Just before entering the area where the rogue synth presides, X6-88 will reveal to the Sole Survivor that Gabriel can be taken down peacefully by speaking his code phrase. Regardless of whether the code phrase is used in the next area, Gabriel will be knocked unconscious, and X6-88 will thank the Sole Survivor before teleporting back to the Institute with Gabriel.
 * 5) Return to the Institute, and speak with Father, who will then grant the Sole Survivor their own personal quarters within the Institute.

Notable loot

 * A copy of a U.S. Covert Operations Manual can be found in the raider town.
 * In the captain's quarters of Libertaria, a unique shotgun called the Le Fusil Terribles can be obtained.