The DoE Expansion Set has many stunning and useful pieces that greatly enhance your DoE set-ups. Only 1,500 sets were produced! The pieces included:

Den of Evil Expansion Set, (30 pcs)

2x Intersection 4 x 4 (similar to the pieces in the RotA Set)

8x Inserts (similar to the pieces in the RotA Set)

1x Double Door

2x Short Passages

4x Curved Corners

2x Demon Lava Walls

2x Window Walls

1x Pyramid

4x Lava Floors

2x Straight Walls

2x Tentacle Walls

More Information Here