Thaumic radiation can cause invisible damage to build up in a Mortal to eventual dire effect.
The best way to get from place to place in Bloodmarsh is to avoid going through Bloodmarsh.
A big project is underway among the ARSEs, and they're trying to cover up whatever it is.
Wizards can deliberately construct complex spells from very silly spell elements. This is a parasafe, hemideadly task even for the highly trained.