basicly whats happening in the plot is this. There is a group that have found a way to siphon power off magic capable individuals. There is some leakage from this proccess however, so un used 'power' is flowing out into the world. The group is pushing it off their plateau (there are 3 platues in a stairstep like setup) and ignoring it. On one platue its created Elementals, on the other its made every beings connection to magic twisted, so that its harder to use magic and any creature that is somewhat connected to magic is getting a sort of constant buzz. Making them go crazy after a time. For humans, who can tap into magic, they are finding it harder and harder to use magic - its just not as effective as it used to be.
Since both Priest spells and Mage spells use the same SP pool, i wanted to affect them together. I think i may give many mobs a resistance to magic while the party is in that last plataue. I dont want to reduce their stats, cause thats not really the issue - they are still as smart as they were before, just now magic is harder to work with.
Think of it like clay, and normal magic is a very mallible clay and easy to mold. Magic on this level is an older, dryer clay, and is very hard to mold. It takes more energy to do.
Im liking the resistance to magic bit - its pretty similar, but i dont think there is a way to make heals less without affecting a characters skills.