DC

Difficulty class Difficulty class, or DC, is the number that a player must meet or beat to succeed in a skill or spell check

The DC depends on the task.
 * Some skill checks are fixed,
 * Those set in conversations, such as for Lore or Diplomacy
 * Those attached to objects you can interact with, such as locked doors or traps
 * Others are calculated on a case by case bases
 * Casting a spell - this varies according to the level of the spell
 * Opposed checks - these are if you are being checked against an opponents score (which will vary with their die rolls), for example when your Hide check is countered by their Spot check.
 * Skill checks are calculated and applied - it is only your total that is considered, there is no auto fail on rolling a 1, similarly there is no auto success on rolling a 20.


 * Characters usually need to make a Saving Throw against harmful spells aimed at them (some have no saves)


 * To avoid all damage you need to meet or beat a DC =10 + (spell level) + (Casting Ability Modifier) + (Caster's feat bonuses)


 * Feat such as Evasion allow you to mitigate/avoid damage taken, even if you fail.
 * Unlike skill checks - rolling a 1 is an automatic fail, and rolling a 20 an automatic pass.