Update 1: Lol. Morchok and Zon'ozz made me yawn so far, just like Normal. I found almost no difference, except that Morchok lived for 5s longer because there was two of him and it glitches.
Update 2: Yor'sahj and Hagara too. I even pulled Yor'sahj with all his slimes up. AO+AE = looks like a unicorned rainbow-jizzed everywhere, lololol. In all seriousness though, first 4 bosses I 100-0'd without taking 1 point of damage because Ice Barrier is ftw. It's pretty nice as it's over 20% of my HP with 5556 SP (248k HP, 27,502 Ice Barrier).
Update 3: FUN FACT: Forcing Gariona (Blackhorn) to retreat before Blackhorn is dropped onto the boat causing you to fall through the world and die XD (Edit: Apparently the same happens if your Supernova doesn't kill both the drake and the add that's riding him -_- Died TWICE because I kill stuff too fast lol)
REAL Update 3: Okay so I took some damage on Blackhorn, but I'm watching Game Grumps and barely paying attention because it took forever for shit to spawn and come down. Ultraxion is a pushover still, so at least Experiment 12-B is available (on Heroic too, lol).
Update 4: Just like I expected, Blood Corruption: Death is why we can't solo Spine, but then again, ANY non-healer can't solo it either. The only thing I can think of is constantly killing the Corruption tentacles, but how you can manage that, the extra amalgs, the bloods, and the constant moving for the rolls; I don't even. That's way too much for any one person to do. I'll make sure Celestalon realizes this.
Update 5: Did Spine on Normal, and they did in fact overlook that Spine was not soloable on Heroic.