Rogue Courser

Rogue Courser is a quest in Fallout 4.

Quick walkthrough
Kill a Courser at a location.

Detailed walkthrough
This only occurs when speaking to Preston Garvey and after destroying The Institute during the main quest. The Sole Survivor is pointed in a random location, where a Courser has joined a raider gang. Wipe out the tagged foe and (optionally) any other of his raider friends. Then report back to Preston Garvey for the reward.