I lead a small raid (8 people) through BRD to MC over the weekend. It goes pretty fast (though we had to run back to lead Crake through because he joined late). The only real challenge are the triple flame spirit pulls. Here's some pointers if you do this:
Be in a raid group: The first time I did this, we got all the way to the entrance to MC and then I couldn't enter. The group leader refused to convert to raid because he wanted to do Princess quest (which we wiped on because we didn't have a mage to deal with the swarms of guards on the torch part). The quest doesn't show raid group, but you will see when you try to enter that you have to be in a raid group to enter the instance.
7-Day Lockout: If you do form a raid to go do this, you need to be aware that you will be locked out of other MC raids for seven (7) days. They restrict the number of MC raids you can participate in to avoid farming by large guilds, by imposing this time limit. It is a major pain in the ass and prevented me from joining the MC raid this weekend because I helped guildies run this earlier in the morning. Subshack had the same issue occur to him.
Once you enter MC, the core fragment is right by the entrance and well away from any agg so you don't have to kill anything. You then exit the instance and speak to the quest giver (Lothar, who is incidentally right where you exit) and he grants you the power to enter MC using the window next to him. The window looks like you are about to jump into the lava and there are no swirlies indicating an instance entrance there. However, it works, just walk up to window and jump through after you complete attunement.
Beafraede - 60 Undead Priest, 291 Enchanter/300 Tailor
