If you begin The Ultimate in 5.0, the following quest is in your journal: https://imgur.com/a/1oWEc1k That's 15, yes 15 big bad bosses that you must defeat in combat.  They can be clicked for some more, very brief details.  There are specific warnings on many of them not to take alternate resolutions to their encounter. So, uh, who has a build that can do them all within the time restrictions required by Magran's Fires?