Cleansing the Commonwealth

Cleansing the Commonwealth is a Brotherhood of Steel radiant quest in Fallout 4. The quest is obtained from Knight Rhys in the Cambridge Police Station.

Detailed walkthrough
Each quest gives a random location containing a group of foes, either super mutants, feral ghouls, Children of Atom or synths. The Sole Survivor must eliminate the target among the group and report to Knight Rhys for the reward. It is not necessary to eliminate the whole group of troublemakers, there is only one targeted individual that the player must eliminate.

Bugs

 * Bugged out on Coast Guard Pier, Breakheart Banks, Bedford Station, and University Point section to some and will not allow completion (Verified on Breakheart Banks and using the console command will break the quest giver Knight Rhys making him repeat a few verses saying that the location is not going to clear itself.
 * Breakheart Banks bug duplicated and verified. The quest can be completed with the command . This will complete any active Cleansing the Commonwealth quest and enable the player to turn in the quest.
 * Breakheart Banks bug duplicated and verified on Xbox One. On fast-traveling in, the compass marker was absent. After walking around looking (unsuccessfully) for bad guys with V.A.T.S., the marker reappeared. However, the distance marker disappears when the distance is below a value of 33 to about 55. When approaching from the West, it is possible to get closer before the marker disappears. The critical distance is larger when the Sole Survivor is to the East of Breakheart Banks. It may be significant that prior to attempting a "clean-up", the Artillery was called in. Maybe the explosions blew a Super Mutant a long way away, and he survived. Multiple attempts to clear this by returning to Rhys were ineffective.
 * Locations do not always reset, and while the area may already be cleared, the quest will not complete.
 * In rare cases this quest can cause your whole game to simply crash, causing you to lose valuable progress.
 * This quest may give you a Far Harbor location, even if you have not started the Far Harbor questline yet. This can be fixed with the console command  (see the note above), which sets the quest state to "Report to Knight Rhys".

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