New atlas system for Bosses (idea / suggestion)

It would be an arena map system where you would face a boss at the end and get a reward. Similar to a Diablo 3 cleft.

The system would be similar to the Lord of the Rings Middle Earth Nemesis System, and the bosses will take different forms. The player can reset the boss using some type of orb.

The atlas would be for the player to adjust the system