Just started to explore eastwards, having done the old 5 badges crusader run quite easily (thanks platemail) and the cool boy quest. Then started exploring further and did the friged battlefield purist quest. As I read something here about reviving nagas, I aimed for killing both of them in short succession. So I wittled both of them down, then killed the memory of the east (the one with death protections) and afterwards fireballed the memory of the south to death. This was on my first try as a purist transmuter, which was actually not supposed to be a real run, though as I discovered that i had Binlor spawned I though I could also give it a try. Though I'm pretty sure I ran into a bug and as it was the first run I'm not sure about the intended behaviour:
both bosses needed just one more hit/fireball
1. killed the memory of the east physically
2. killed the memory of the south magically
3. winning dungeon sound plays, as well as popup "WTF is happening? somehow this can be stopped?" and memory of east revives, no reward and no highlighted stair case
4. hitting a few times memory of east, memory of south stays dead, running out of resources
5. wanted to run away, though the sign says "Win", as such winning the dungeon
not sure what the buggy step is, 3 or 5?
Up to that point, I very much like the east, the quests are also awesome as they continue to challenge the players, I also liked the cool guy (at most 10 monster killed) quest, though it was a bit painful to track those killed monsters. (An indicator in the quest/badge page would be awesome, like 5/10 would be sweet)
The frigid battlefield is definitely harder than the dungeon before, as it was quite hard to get rid of the frostburn, but that may also be partly thanks to the prepped platemail.

The curious badge is something I love! It gives a good reason to revisit all the old dungeons and spices things up!

Hobbler's Hold was quite a surprise, which I just stumbled barely through on the first run.

The new trait tutoring is also really nice for a teaching, the puzzles weren't too hard, though 2-3 of them had me stumped for a bit and I wondered if they somehow got broken, though in the end I was able to beat all of them. I think in one puzzle I even had a health potion left over.

Another thing that would be nice to have is to allow the PQI to also go for the new dungeons. Though as the PQI flag messes up the normal quests, maybe the new dungeons could only be allowed when all new quests are finished, i.e. only a PQI flag may be available for the dungeon.

Nevertheless, I'm very impressed with the quality of the additions. I think they are very well thought through and add seemingless to the base game. Big Kudos to everybody involved!