Despite getting 2nd boss down to 8% on day 1, we didn't even get her to phase 2 on day 2.
Wednesday crew sorta struck, I guess, but it was disappointing!
Biggest thing I think for 2nd boss is just to make sure everyone is clear on what they're doing. There's no one right way to do it, apparently, but the fight is damned confusing if you just sort of walk into it expecting the raid leader to give you a simple instruction or two. I spent far longer than I should've looking at the log of our best attempt from day 2, and noticed a couple things that were somewhat subtle problems for us:
1) Our 4 ranged dps on add duty weren't on their A game, which combined with many waves in a row of an extra Fanatic spawning in the back instead of an Adherent spelled trouble -- these 4 must play well from the start til the end of P1! Once they fall behind it's hard to ever regain that ground barring unnatural luck on the back stairway spawn.
2) Decursing is really, really important. We had 3 people assigned to decurse. We're stepping it up to 5 next week, and making sure everyone knows not to use abilities while they have the curse on them. Having a tank die cause his Pally didn't get decursed fast enough and locked himself out of Holy Light, Flash of Light, *and* Holy Shock, without saying anything in vent, made me very sad.
3) By far the biggest -- Vampiric Might. It does a lot of healing for the Fanatics, which sets your ranged on add duty back a lot. Dispel it. Better yet, spellsteal it, not only removing their substantial healing but giving your Mage 25% more damage for a bit! Despite what some guides seem to say, they cast this regardless of being Empowered or Reanimated. They cast it 10 seconds after they spawn, in fact, from what I've seen.
Between our 4 ranged not playing as sharp as they can, and I don't think any of us realizing quite what Vampiric Might was, it was a poor night. :p Being forced to go with 7 healers due to Wednesday reasons didn't help things out... the enrage timer is surprisingly tight in this fight given how easy Marrowgar is.