Fallen Hero

Fallen Hero is a miscellaneous quest given to you by Joe Savoldi, owner of the bar at Bunker Hill.

Detailed walkthrough
The quest is obtained from Joe Savoldi in Bunker Hill, who will most likely be at his bar/motel on the West side. If he has never been spoken to beforehand, he will rope the player into a dialogue trying to talk his son out of joining the Railroad. After this, normal vendor dialogue will be available, through which the player can request information about the job.

Joe wants the player to find any trace of his grandfather Brent, a member of the Minutemen up until his disappearance. The default payment is 150 caps, but the player can attempt up to three increasingly difficult Charisma checks to to increase the payout. Whether the player accepts or refuses, the objective is added to the journal.

To find Brent's remains, the player must first travel to the Old Gullet sinkhole in the Malden region of the Commonwealth, a ways north of Bunker Hill. The cliffs can be difficult to traverse, but they are easiest to descend from the northern side of the sinkhole. This also better positions the player to deal with the deathclaw squatting in a ruined building at the bottom of the sinkhole. The player can either kill it or avoid it by jumping into the water and letting the current carry them into the cave below.

The player is deposited in a small pool in the cave below, containing one glowing and one normal radroach. Brent's remains are nearby, along with his hat. Pick up the hat and the copy of the Wasteland Survival Guide on the cooking equipment. Proceed through the tunnel to fight some feral ghouls and a glowing one, then proceed up the stairs and exit to a ruined house just west of the sinkhole.

Outside the house is a random spawn point, which may be another deathclaw, with or without members of the Brotherhood of Steel fighting it. Unchain the door, deal with any threat that appears, and return to Bunker Hill.

Back at Bunker Hill, present the hat to Joe for the reward. Additionally, if the player has joined the Minutemen, he will let them keep the hat. The objective updates and the quest concludes.