The Preacher

 (simply called wastelander ingame) is an inhabitant of Washington, DC's Seward Square district in 2277.

Effects of player actions
The Preacher is standing on the second floor of a building in an alleyway west of the Reilly's Rangers headquarters entrance on Seward Square. The alley has been rigged with Mines and Mini Nukes that he detonates if you try to get close to him. There is a hostage (another Wastelander) on one end of the alley, who you can talk to. If you are looking at the Preacher when he detonates, he waves at you. He also dies in the blast.

There are a few different routes that can be taken to achieve a resolution. You can talk to the hostage, and through a charisma check, convince him to confront the preacher. Doing so will result in the detonation of the mines and mini-nukes. This will result in the preacher's death as well as the hostage, thus resolving the situation. Alternatively, the player can kill the preacher using a ranged weapon of choice (Gain Xp). Or by using a Stealth Boy and picking up all explosives in the alley, the player can survive detonation by hopping out of the alley immediately; this will also kill the preacher, but you will lose the five mini nukes. Note that none of the mines are actually "armed"; they can be picked up without the need to disarm them first. You can also shoot & kill the Hostage & gain XP with no negative karma. You can kill both & get XP.

Mini Nuke locations:
 * 1 behind three metal barrels
 * 1 in between those barrels
 * 1 on a pile of rocks to the immediate right of the boarded up Preacher's door
 * 1 on the far side of the alley, on a merry-go-round
 * 1 immediately next to or in the shopping cart (opposite the door)

Notable quotes

 * "Not one step further! Not one! Come no closer! I'll do it! I'll blow us ALL to hell! All of us! Me, you... and the worm..."
 * "You don't know, you can't know. Little fools. You wish you knew! You wish! But only I know! Only me... only me... only me..."
 * "Trees! So many trees! To the north! But be careful... the trees... are deadly, and the trees too will be consumed in the belly of the great fat worm!" This quote appears to be a reference to Oasis, a location full of trees that is indeed far to the north.
 * "In fourteen-hundred and ninety-two, your mother and my mother were hanging up clothes around the mulberry bush.

Appearances
appears in Fallout 3.

Bugs

 * The Preacher may blow himself up even if you are blocks away and you have not seen him. You can tell when you see a massive explosion a few blocks down.
 * The player may find the Preacher dead and the hostage missing but all of the explosives still in place.