Rechan said:With that in mind, there will likely be a lot of "home remedies vs. magic"; the aforementioned cold iron, salt and running water to defuse magic, etc.
You have to be somewhat careful here though. If a ring of salt, running water, cold iron etc. all make magic not function/function differently - why isn't it everywhere?
Why don't most buildings have salt mixed in with other building materials (or cold iron or whatever) - castles with moats (that have some kind of system to keep the water flowing) take on an additional meaning - stuff like that.
Also do these things work on only the arcane power source or all power sources - if only the arcane what, if anything, blocks divine and martial sources?
Just pointing out you have to be careful not causing more questions than you've answered.