maybe it just affects the chars that were high level already and didnt climb the top with the new profecencies,
dunno if there is something like ore passive features on them.
but as things look on my 77 fighter, 70 mage and 50 rogue i got NO chance at all vs wells and my gear was ok in the past always

yeah its the damage, they hit much harder now, especially wells pwn me i cant even heal myself proper but get killed with 1-2 hits some times.
dunno if its true what some people say, that critical hits now work proper on monsters, too, or that they get some bonus from the profecensies as well.
hoping for some official news, as things look now it looks like my built has become worthless again.