Coils of Bahamut... and its inconsistent challenge level.

[HyoMinPark]

The instakill mechanic hosed up and wasn't powerful enough to kill us, so it locked up and stranded us there... doing exactly what you just claimed would be just fine... ie... going in at level 60.

The phase would have pushed in 2-3 minutes after the Cube, Sphere, and Egg show up anyways. It's a DPS-check. If that didn't kill you, well then congratulations. You survived and can continue the fight. If you wanted to just reset, all you had to do was walk into the center where the boss was hidden/just hanging out. That is instant death. T11 probably also has an enrage, so you could have just waited for that, which is usually 11-13 minutes into the fight. Either way, you weren't "stuck" there.

Of course, if the mechanics had been done properly, then none of this would have been an issue. Still have to pay attention; even at 60.