Pull on your nerd hat and prepare for another one of those OMG WTF moments of "Why didn't I think of that one?". So there is a guy that put togather something called BrickQuest. Basically he took the original board game idea added a little Everquest, a little AD&D, and built the sets with legos and lego characters ala pewter miniatures. One other thing it reminds me of is an old game written in GW-BASIC in the 80s called Wizard.bas in that you don't know what's in the next room until you move there. But wait, that's not all. It has ninjas! Black ninjas and red ninjas and even a Ninja Warlord. What's not to love about this game? As far as I can tell you basically have to buy all the legos yourself and then put it togather with some imagination (or copy the stuff in his images) though he does provide a rulebook. Lego ninja's for the win!
If you're a lego ninja nerd and you can't help it head on over and check out the BrickQuest board game.