>- Give shield to every pure mage class at 42 (Sorry A-P's,
>your still screwed) that can only be used once a day (12 hour
>duration, 24 hour timer). Using from a wand has no reuse
>timer.

Shield is kinda bland due to it being common to all. I think a nice middle way to normal class tweaking would be to make it at least cosmetically different by making different supps for all classes. So, make it something that fits the class theme and is incompatible with shield. You could also consider adding some minor, theme-fitting perks to it that differentiate it from one class to another.