Karazhan has a side entrance.
Karazhan the door is locked.
It may be locked to killing curator or nightbane i m not sure.
Just walk up to the door and it ll unlock and open.
If you come in from the back exit you get there by going to the ramp to the upper part going right instead of up the ramp and then going right again.
The portal is found when climbing the tower to the right of the main entrance across the small creek the stairs lead to a bridge and to a door which would be unlocked from the inside once the opera event has been cleared.
There are actually a few doors like this one across the map all blocking a.
In patch 7 1 the side entrance was re purposed for the return to karazhan dungeon.
When you first enter the dungeon you ll notice that to your left is a locked door that says it requires some rusty keys.
On the dungeon preview page they even say.
This is a large dungeon with a raid like feel in which players will want to revisit as they work their way through.
To allow time to do this.