Increasing the DC

[Morris Chan]

for spells like fireball there is:
spell focus
Greater Spell focus
Elemental focus
Greater elemental focus

but is there a way to increase Conjuration DC besides:
Spell focus
Greater spell focus
and your STAT (int/wis/cha)

Most conjuration spells don't require saving throw I understand but I plan to focus on ones like Aqueous orb, create pits, grease.
Spells that control the battlefield and locks up monsters.

[Axebeard]

some spells have associated alchemical power components, like vials of acid or pots of grease. Consume a pot of grease when you cast grease to up the DC by 1.

[Bob_Loblaw]

Some conjuration spells are also elemental spells.

[FuelDrop]

arcane bloodline sorcerer: 15th level power grants +2 DC to one school of your choice. combine with spell perfection, spell focus and greater spell focus for a lot of awesome... though if you were doing fireball and had elemental focus and greater elemental focus for both fire and sonic, then use energy substitution to make it half of each... DC 29+cha.

[WhipShire]

Heighten Spell (Metamagic)

You can cast spells as if they were a higher level.

Benefit: A heightened spell has a higher spell level than normal (up to a maximum of 9th level). Unlike other metamagic feats, Heighten Spell actually increases the effective level of the spell that it modifies. All effects dependent on spell level (such as saving throw DCs and ability to penetrate a lesser globe of invulnerability) are calculated according to the heightened level.

Level Increase: The heightened spell is as difficult to prepare and cast as a spell of its effective level

[puksone]

Meta Magic Feat: Persistent Spell

ok it doesn't increase the DC, but the target has to make 2 saves.

you can decrease the saving throws of your opponents as well.

[Corlindale]

Persistent Spell will probably be the most efficient solution, as said. I haven't done the math, but it will greatly increase your chance of succes.

It's not too hard to inflict Shaken on enemies, that will decrease their saves by 2.

Focused Spell also works for some spells, though I personally don't think it's worth it over Heighten.

Lastly, Spell Perfection will double the DC bonus from your feats for one particular spell - though you can't get it until level 15.

For the pit spells, remember that they explicitly don't get a save if you actually push them into the pit - so maybe look at spells that can bull rush, or point your group's fighter in that direction a bit.

[ZomB]

Yup. Pick up a lesser persistent metamagic rod for 9K to increase the effectiveness of any of your level 1-3 offensive spells and extend the useful life of them too.

[Morris Chan]

wow good stuff thank you guy since i am making a summoner, i will be getting the pet to push mobs with one of its evolutions on its claws attacks, so when ever i hit with a claw i can push a guy 5 feet.