Managed to finish this quest with 2 of my kids. The 9yr old being the EWP, my son on his Battlemage and me on my Bounty Hunter.
My Bounty hunter went down, but the BM brought me back with a healing spell. If my daughter was not so hellbent on slaying my sons character, she may have quite easily slain us both.
She did take out both his summoned Great Elementals with much delight.
We managed to get out in two turns, thanks to our running and my sons ability to remember everything. Only one path choice he had forgotten.
The look of total dissapointment on my daughters face that we didnt die though. She scares me sometimes.
Enjoyed the map. Might even bump it a bit up a bit as I said, including all Chaos based monsters. Or have some respawns after killing the demon at the end, to slow the chance of escape.