
Blave |

Class DC: Glossary page 421:
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Your class DC = 10 + your level + your key ability modifier. Nonspellcasters use their class DC as the DC for many of their class features.
Spell DC: Glossary 423 under "Spell Roll"
Quote:
Your spell roll modifier is equal to your proficiency modifier plus your key ability modifier, as well as any other bonuses and penalties (though these are quite rare). Many of your spells will call for saving throws against your spell DC (10 plus your spell roll modifier).