Make prot/etc spells castable to multiple people at the same time.
For instance unstun costs 123 sps.
Make it so that you can cast it like:

cast unstun at player1,player2,player3

This would take 3x the sps, and it would lower the spell% by 10-15% for
each target. So the chance of unstunning three people would be at max 70%
if you'd have unstun at 100%.

Having a spell over 100% would dramatically decrease the chance of failure
of the spell. For instance having unstun at 105% would lessen the decreasing
factor of unstunning multiple persons to 5-10%.
This would also go for conj spells and such.

Now, this would not be a huge uptune or would not cause a massive hysteria.

It would justify making equipment that give few spell% more that would
otherwise seem like a waste of carried weight, and would give reason to study
some spells to 100% which you would otherwise leave hanging around racemax.

~/A