Originally Posted by
Eapoe
So far I haven't experienced any boss to be truely difficult. The closest to a difficult boss is Coven, mainly due to the sheer number of mechanics. Yes, they are in a set order, but our first night working on mythic it seems like there is always something going on. It also seems to be a long fight. So, when you take everything into consideration, there is always something to be looking for, whether it's a spinning blade or shadow blades or a frozen orb or the adds to kill/avoid or the storm, or any combination of those. It's honestly almost the same fight as heroic except the additional boss that brings new mechanics and an interrupt rotation.
It's more hectic than difficult, and most of the difficulty comes from some of the RNG aspects of the fight.
I'd say Imonar and Kingaroth are a close second (so far) on mythic, and a lot of that comes down to personal responsibility, and certain mechanics that require decent organization.
These comparisons are on mythic. Haven't gotten to Agg/Arg yet to judge them.