Show No Mercy

Show No Mercy is a quest in Fallout 4.

Detailed walkthrough
Meet Elder Maxson on the flight deck for your first mission as a Brotherhood Knight after familiarizing yourself with the Prydwen and the crew.

You're to head out to Fort Strong to cleanse it of all hostile super mutant forces and secure the armory which will give the Brotherhood an advantage in the upcoming war.

Step onto the Vertibird and man the minigun. Use this weapon to cut down the super mutant behemoth (you can also use the minigun to kill any remaining super mutants after it lands) roaming the grounds.

Disembark and remove all indicated super mutant threats and enter Fort Strong's armory and exterminate all hostiles on all floors in this location.

Talk to Paladin Danse, who decides to stay and make sure the armory is secure (you can also pass a medium speech check and ask why he hates super mutants so much) before returning to the Prydwen for a reward from Elder Maxson of Vertibird signal grenades.

The option to purchase extra signal grenades from Proctor Teagan is unlocked.

Quest stages

 * Elder Maxson has ordered me to head out to nearby Fort Strong and cleanse it of all hostile super mutant forces. There's a vertibird standing by on the Prydwen's Flight Deck that will fly me to the location.


 * I've exterminated all Super Mutant forces at Fort Strong. I should link [sic] speak to Paladin Danse before I head back to the Prydwen.


 * Paladin Danse has ordered me to return to the Prydwen to speak with Elder Maxson.


 * Elder Maxson was pleased with my work at Fort Strong and has provided me with Vertibird signal grenades to call in a vertibird if I need it for travel.

Bugs

 * Companions, particularly Paladin Danse may fail to board the Vertibird if the Sole Survivor rides first. To remedy this, it is advisable to order the companion to board the Vertibird first.


 * After getting the quest and talking with Elder Maxson the marked Vertibird to take you Fort Strong does not appear. If you quit and reload, it will appear but not allow you to enter. You may need to take the Vertibird on the opposite site down to the ground underneath and back to hopefully be able to use the marked one. Saving and reloading does not resolve the latter issue. This can be solved on the PC using the console, open the console, click on the Vertibird and type "activate player".


 * If you ignore the Vertibird because it is not allowing you to enter, you can go on foot to take Fort Strong and complete the quest. However, if you have a companion with you, the companion will remain on the airship flight deck and you cannot talk to her/him/it thereafter. Swapping out companions will always result in the new companion leaving you (wherever you are) and appearing back on the airship flight deck. Quitting and reloading does not work. To resolve, summon a Vertibird using a grenade obtained from Maxson and enter. After landing, the companion should be with you again.


 * Another bug happens when the player has cleared out the Fort Strong Armory. The next objective is to speak to Paladin Danse.  When the player engages Paladin Danse, he immediately attacks.  He will take no damage.  If the player fast travels to the BOS Airship, the BOS will also attack the player instantly.  No clue why this happens.  It makes this game frustrating.


 * After getting the quest and talking with Elder Maxson the marked Vertibird to take you Fort Strong doesn't work. You may need to take the Vertibird on the opposite site down to the ground underneath and back to hopefully be able to use the marked one. Also try quick traveling to a different location then quick travel back. Once geting on the marked one the Minigun wont work, even after loading previous saves, and restarting the game the minigun nor any other gun work( this includes punching).


 * Trying to shoot while on the vertibird won't work. The bug actually occurs a bit earlier (not able to display/shoot with weapon) by recruiting paladin danse as your partner. Using the text dialogue to go alone usually fixes this bug.


 * After clearing the first section of the Armory, the V.A.N.S. Perk and the quest marker tell you to go outside. Exiting Fort Strong Armory and returning to turn the quest in will not work. You must enter the elevator car in the East corridor to proceed to the larger testing area to finish clearing mutants. You will then be notified with a quest update and Paladin Danse will show up (if not a companion) as you exit this area to comment on the results.


 * Sometimes the vertibird will not show up, and your quest marker will tell you to take the vertibird to Boston Airport. Saving and reloading may fix this.