From the back of the box:
Become a videogame-style villain, build a deadly dungeon, and crush puny heroes in this retro-inspired tabletop game!
Take your dungeon to The Next Level™ with Boss Monster 2!™ Become one of twelve all-new Bosses, build deadly Trap and Monster rooms, cast versatile Epic Spells, and face new challenges like Hybrid Heroes and Dark Heroes. This all new set of 160 cards plays as a standalone game or as an expansion to the best-selling original. This special limited edition features 14 holofoil cards, including the treasure-stealing Silver Dragon.
Boss Monster 2™ ...Now you're slaying with power!