We did M+ 10 CoS last night. Well past the timer, but weren't going for that to begin with. First two bosses super smooth. Last guy we spent about an hour and 1/2 on attempts. Going at him once ever 10 minutes waiting on lust to come off cooldown in between. At +10 with tyrannical his AE pulse was essentially a soft enrage, which is the same as any other mode I guess, just would happen super quick. 1:45 into the fight, every single attempt, I (mage) would die. A few seconds later our druid drops, every attempt. I'm battle rezed and have about 15 seconds of burst before that AE pulse and I die at the 2 minute mark.
We were banging our heads against the keyboards for about an hour doing that over and over, getting him to 3% each time. Group had two brez so the way we finally beat it was to save that 2nd battle rez for me to give me another 15 seconds or so of burst dps rather than bringing up the druid at his 1:50 death. This left us without a healer for the final minute of the fight, but considering that AE ability would just wipe any non tank regardless it seemed like the right call.
Felt good to finally get it down and should have an 880 piece waiting for me when I get home. Hope it's something nice.