kandera/TrinityCore — comment on commit f84fcd11d51452d22d6b7306c03f225a31e33e00
File:  line 0
By kandera:

as far as i can find the raid leader acts like the key to unlock the instance. this just allows raids to be able to enter on heroic mode like they are supposed to. and the same thing applies for toc except icc has the ability to switch modes between bosses. maybe the way to do the switching modes is to set up a phased instance.