The last boss fight is almost unplayable now! Trying to complete our first master run and you shoot a bell to go to the nightmare realm and we just get whiped for no reason. So tired of trying to complete this and dieing for no reason! Yes we all stand on the bell to go to the normal realm as well.
Bungie is aware of the issue and it was added to their sticky thread [url=https://www.bungie.net/en/Forums/Post/261466469?sort=0&page=0]Season of the Haunted Known issues/Vital Info. - Updated July 27[/url].
[quote] Players can sometimes die when transporting to the Nightmare realm in the Duality Dungeon.[/quote]
Moving forward I would advise caution when playing the Duality dungeon because this may repeat itself until it is patched, or avoid the activity entirely if it causes you distress.