Amoral Combat

Amoral Combat is a side quest in the Fallout 4 add-on Nuka-World.

Quick walkthrough
As the Overboss, you must be the absolute authority over the gangs in Nuka-World, and that is more or less true. But now, someone has followed in your footsteps, and completed the Gauntlet. Meet this challenger and defend your title.

Detailed walkthrough
After completing The Grand Tour, the next time Nuka-Town is visited, a gang member will inform the Overboss that a new challenger has reached the end of the Gauntlet, and they should go talk to Fritsch to find out what to do.

Locate Fritsch in the Nuka-Cade. He will say a new target has entered the Gauntlet, and gives two options: allow them through to the arena, or drive them out. Driving them out prevents acquiring whatever gear the challenger has, but finishes the quest right there. Accepting a fight means the player has to face the challenger and beat them.

If you choose to fight, head to the Cola-Cars arena, meet the foe, and best them to maintain the title of Overboss.

This quest is repeatable, with a new challenger every time, culminating in the Rogue knight, who, upon defeat, will drop the unique weapon Aeternus.

Bugs
The quest may not start as intended. To fix this, try to return to Nuka-World using the monorail and go through the Gauntlet again. You can also fix this on pc by using the console command.