There is a lego kit based upon D&D apart of the Lego Ideas range, called Red dragon tale along with a 12 mini figure series in blind boxes that just come out resently, the main kit is expensive but there is also a QR code to give you a game to play, it has a bunch of Mini figures including a villian, whose idenity will remain unknown, creature wise, you get a phatom beast (I think its called that, not to sure as I'm not a expert) an Owl bear, then for monsters, you get the cube monster a big one and a small one, a beholder (creature with LOTS of eyes) a few skeletions, of course, the crowning part of the kit, is the Red Dragon, who is pretty huge but the only problem, is balancing him to get the look on the box! The kit is spilt into four main parts across four bookets:
1: The inn, two levels that can be spilt into three segments, ground floor, upstairs and the roof
2: Outdoors and the first part of the dungeon
3: The inner dungeon
4: The tower
There is a few other things but if you get the kit, you can see it for yourself, thou it also ties in with the castle theme a bit, its generally a good build! The blind boxes offers 12 different characters, some good, some bad and alterative heads for some of them, so there is some options