The highlight of this xpac is The Lord's Labyrinth, a maze of traps and terrors generated fresh everyday. Die once in the labyrinth's bowels and you'll have to start over, upping the stakes in an already challenging game. Riddling the labyrinth is a series of boss fights with one Emperor Izaro which, intriguingly, promise to evolve based on your actions in previous bouts.
In addition, 19 Ascendancy classes (no half measures, right?) add branches to the massive skill tree, one class unlocked upon each completion of the labyrinth. Andy took a look at the Berserker build last month.
All in all, Ascendancy aims to demand more brainpower and nimble fingerwork than we've become accustomed to from the dungeon crawling genre.