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Chapter 8: Playing the Game / Checks

Spell DC

Source Player Core pg. 403
Many times, instead of requiring you to make a spell attack roll, the spells you cast will require those within the area or targeted by the spell to attempt a saving throw against your spell DC to determine how the spell affects them. Calculate it using the following formula.

Spell DC = 10 + spellcasting attribute modifier + proficiency bonus + other bonuses + penalties