I'm going to be a sorcerer starting at level 16. If anything I've got so far looks dubious by RAW please say so. Otherwise, I'm looking for additional things that could boost save DCs. Persistent spell is already in use (with magical lineage).
First, raising charisma:
18 base
2 racial (ifrit)
2 fire elemental bloodline (effectively)
6 enhancement
4 leveling (starting at 16)
3 venerable
2 succubus
5 inherent
42, modifier of 16
For save DCs:
13 base for a level 3 spell
16 ability mod
1 familiar activating wand of arcane concordance
4 spell focus and greater with spell perfection
2 arcane bloodline (crossblooded with elemental)
2 heighten (unable to go further due to spell perfection wording)
1 trait (outlander, lore seeker)
39 save DC
The spell I'm upping the DC for is pellet blast. This is because there's very few (or none?) things outright immune to piercing damage, and thus they'll be subject to the effects of dazing spell. I'd be willing to switch to a different spell that offered no SR and has a wide area if it could have elemental focus (and greater) applied to it, and reliably affect anything, whether by doing 1 point of damage or succumbing to something else to trigger dazing spell. Reflex save based spells are preferable, that seems to be the most common weak save. The spell must be 5th level or below, due to dazing and persistent causing spell perfection to chafe at the level 9 cap.
However, the metamagic master trait is being used for intensify spell, to ensure the spell does enough damage to break through DR. I don't like taking this feat, however. Is there another way to reliably make sure the spell will punch through DR, or otherwise always make victims subject to daze? I would love to drop intensify spell and replace it with something else, and also reassign metamagic master.
Geyser is a spell I'd consider replacing pellet blast with, for instance, but it does piddly damage, so I'm not sure how I'd make it so that it could affect creatures with even meager amounts of elemental resistance. Something like the havoc of the society trait would work, though I can't take it with magical lineage, as they're in the same trait category.