#1 - June 25, 2013, 7:40 p.m.
Anyway, I found a new way to enter MC that I've not seen mentioned. Likely need to be attuned for it still to do this.
Obviously go to where it is, in Blackrock Mountain and go to where the BE Lothos Riftwaker is. Now... rather than talking to him, turn left. You'll see a window overlooking the lava below. Walk right through the window, as if to jump into the lava...
You're welcome.