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