Awesome, small but action-packed DLC that tickles all the best there is to experience. Hordes of enemies, challenging rooms, and a few secrets sprinkled about. Had lots of fun beating it with a friend, and then some extra value out of beating it solo with standard robe on both modes. It poses rather fair challenge (although nullify-room required some patience to get right) and was a much-needed refresher after what a mind-numbing barf of an experience the Vietnam DLC was.
Dungeons and Daemons is peak at what a Magicka DLC should be like. Perfectly contained, challenging, and - fun!
There is ONE nitpick I have, however… and no, it is not the crashes (that is a given, at this point, but nothing a few restarts can't fix). The boss can just… well, phase through a wall and disappear off the screen, making it impossible to complete the stage as he can absolutely get stuck in there. This is, thankfully, a rare occurrence and only caused a couple restarts after quite a few dozen runs I spent playing this DLC. I think I had more frustration trying to have him not touch the sawblades for certain achievement than him doing this magick trick, so I think you should be fine.
Very, very solid DLC.