all this on the lvl100-premade server:
ragnaros 10man iss also bugged. if you bring him below 30% before he finishes his first cast (splitting blow??), he will disappear below 10% and reappear just to smash his hammer one more time, even if you have looted the chest allready.
cleared fl 10man in no time, same for BoT 10man.
Killed DS25 4/8 nhc without problems.
you can't solo ultra25, because it requires 3 players to take dmg from hour of twilight -> wipe after the eruption cast. maybe doable with more dps (crit/haste/ap).
stoneguard in mogushan hits like a wet noodle but the bleed dmg hasn't changed (30k ticks).
first boss in HoF resets on 3rd plattform (MC), needs more dps.
just to clarify old stuff:
molten core: every boss is a onehit, raggi died from my CS crit (multistrike proc).
doomlord kazzak (1.1m life) ate a 1.9m MS
doomwalker is a oneshot
the rest of BC should be the same
Wotlk 25man is np, leviathan might be tough at the beginning -> vehicle dmg has been reduced by 50%. Same goes for Gunship (even 10man). Ulduar can't be cleared, client crashes (or at least crashed for me) when kologarn shows up, ravager isn't enough to kill him. Halion crashes the client, s3d25 is EZmode.
Isle of thunder isn't available (instance not found).
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In terms of challenging content, first some numbers from blizz:
Shows how our dmg will be scaled up in old content.
Clearing MoP 10man (as long as mechanics allow it and everything has been tuned correctly) shouldn't be that hard. After that it's hc or 25man. But the other stuff that's missing right now feels really fishy and more like a letdown, most likely because of the scaling factor and the "fake" numbers feel so unrealistic :/
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Note for Selfheal/Survivability:
Magtheridon crushed my lvl90 premade (ilvl500), 2nd Wind on that lvl is really crappy, IV won't help either. Prot as we know it is kinda indistructable. At the start of the Xpac IV should be a really good choice since our DPS is lacking huge rating budget. The Blood Craze Heal from Prot is really good to fill holes that Shield Barrier coudln't cover up. Gladiator Stance isn't that much better than DPS specs. 30% dmg reduction, that's it. Morchok 25man almost instagibbed me, standard Prot killed him first try.
DPS Soloing at the start can focus on faceroll stuff, that dies within seconds. After that it's all about dmg scaling to compesate lack of selfheal/2nd Wind performance and hoping not to drop from 40% to 0% without a chance to dps (empty gcd, cc etc). Prot does some solid DPS and is still capable to tank some softenrages (f.e. Zon'ozz 25, ignores the orb). Went up to 200% increased Heal/Absorb at Morchok 25 after 3rd stomp. Can't think about any rather long fights, but I didn't test that much yet, maybe create another toon for unused IDs. Maybe checking out Nef25hc, phase 2 is still kinda tricky imo. And Maloriak might also get a bit challenging. Either burst him down before 20(??) adds buff him into oblivion or play it really safe and waste time.