How does one increase DC. Fir example how would a caster get a high DC. MY current 40 level caster only has a DC of 25, lots of chac seem to beat it. Diffulty Class

Pump your main casting stat (both improving your base score and buffing it to the +12 cap), get the proper SF feats and lower or have someone else lower your enemies saves (via spells, curse song, poison, etc.).
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We will die Thanks for the quick reply Kail.