1. White Plume Mountain
Jillian has come across electromagnetism in her studies. Through proper induction the copper coils super conduct magnetism to create massive amounts of heat. You're not just dealing with a wizard, you're dealing with a mad scientist...or maybe where he comes from, science and magic are the same.
Deaphine's questions are valid, but others are more interested in getting it over with:
Tyr runs through but finds things heat up faster than he is. Gwendolyn is able to grab Tyr and pull him along, she is remarkably unscathed, though Tyr does suffer some skin deep burns.
tyr take 10 fire damage, but you are now on the other side. No damage for Gwen, can't argue with a nat 20!
Successfully across the death trap puzzle: Gwen, Tyr
Still to cross: Zar, Jill, Daeph