You maybe didn't. I did, that's why i made that comment. It looked like it was overrun by demons. Constructs where even reprogrammed and turned against Khadgar himself.
And by pure logic, if it will be dungeon soon - that means there are enemys, it is/was not protected but taken over by burning legion, and it seems with really little resitance because i did not see any demon or fel lord corpses there (killed by constructs or defencive mechanisms).