After starting the event at the beginning in Halls of Reflection, ther will be a wall preventing you from running in/out.
If you die you can release your ghost, run in and cast/shoot trough the wall if you are ranged.
If you are Mage you can blink throgh it.
You CAN get feared through it. (There was a consumable fearing you, wasnt it?)
Screenshot (shows my mage casting [through the wall]):
German Interface pewpew