Wow. Impressive doesn't begin to cover it. I was expecting something reminiscent of Harlan Ellison's For I Have No Mouth and I Must Scream or The Matrix, but this one had several intriguing surprises. I will be running this.
Minor suggested change: have the painting show wolves hunting someone. Actually, you could show a hunt with all the details, making it just a pretty show... until they get into the painting, and become a show themselves. Finally, when (if) they get out, a heap or two of old, dry bones could be ejected with them... as a final warning. Go to Comment
The heroes have destroyed the minions, plunged through the catacombs and defeated the guardians. They slowly enter the chamber to find the dark mastermind behind the scheme. The mastermind has a request for them, however:
"You must destroy me. To destroy me is to rid the world of a great evil, that is to say, me. But before you can destroy me, you must understand what evil is, what evil must be, why evil must exist."