Show No Mercy

Show No Mercy is a quest in Fallout 4.

Quick walkthrough

 * 1) Meet with Elder Maxson
 * 2) Board the Vertibird Gunship
 * 3) Kill the Super Mutant Behemoth
 * 4) Secure Fort Strong
 * 5) Secure Fort Strong Armory
 * 6) Speak to Paladin Danse
 * 7) Speak to Elder Maxson

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 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

 * 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.


 * 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 Fort Strong and returning to Maxson, dialogue proceeds normally until the quest ends, but then Maxson abruptly says "you're not getting another assignment until Fort Strong has been secured" and does not engage in any more dialogue or provide the next quest in the BOS line.