bert1001 fka bert1000
Adventurer
I think difficult thing here is that I think its partly intentional math wise that targeting boss creatures with Spell DCs is supposed to be hard
This is true, but I think the math / mechanics have also been hampered by the fact that monster casters need things like incapacitation as well so lower level caster monsters don't gang up and destroy the PCs.
I see no problems giving PCs some special abilities to up DCs, alter incapacitation, etc. especially if limited per day usage.