Term: Save DC

A Save DC often refers to the DC of a class and/or an ability. It is often used for features

The base save DC, no matter the class, is always 10 + a creature's Proficiency Bonus + a governing attribute (such as Intelligence for a Wizard's Save DC, or Strength, Dexterity, or Wisdom for a Monk's maneuvers; dependiing on what they used for the attack/maneuver). For many classes, this depends on their Class Key Attribute

Most Save DCs for creatures in the Beastiary are often set, and adjust based on the creature's Threat Level.