Saving Throw

A saving throw -- also called a save -- represents an attempt to resist a spell, a Trap , a Poison, a disease, or a similar threat. You don’t normally decide to make a saving throw; you are forced to make one because your character or monster is at risk of harm.
To make a saving throw, roll a d20 and add the appropriate ability modifier. For example, you use your Dexterity modifier for a Dexterity saving throw.
A saving throw can be modified by a situational bonus or penalty and can be affected by Advantage and Disadvantage, as determined by the GM.
Each class gives proficiency in at least two saving throws. The wizard, for example, is proficient in Intelligence saves. As with Skill proficiencies, proficiency in a saving throw lets a character add his or her Proficiency Bonus to saving throws made using a particular ability score. Some monsters have saving throw proficiencies as well.
The Difficulty Class for a saving throw is determined by the effect that causes it. For example, the DC for a saving throw allowed by a spell is determined by the caster’s Spellcasting ability and proficiency bonus.
The result of a successful or failed saving throw is also detailed in the effect that allows the save. Usually, a successful save means that a creature suffers no harm, or reduced harm, from an effect.

Saving Throws Against Area Effects

When you succeed on a Dexterity saving throw to avoid an area effect, such as the one created by a Fireball, move your token to the nearest available square outside the area of effect. If there are multiple nearest options, you choose which one.

Monster Saving Throws

The Saving Throws entry is reserved for creatures that are adept at resisting certain kinds of effects. For example, a creature that isn't easily Charmed or Frightened might gain a bonus on its Wisdom saving throws. Most creatures don't have special saving throw bonuses, in which case this section is absent.
A saving throw bonus is the sum of a creature's relevant ability modifier and its Proficiency Bonus, which is determined by the monster's challenge rating (as shown in the Proficiency Bonus by Challenge Rating table, below).

Proficiency Bonus by Challenge Rating

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Challenge	Proficiency Bonus
0	+2
1/8	+2
1/4	+2
1/2	+2
1	+2
2	+2
3	+2
4	+2
5	+3
6	+3
7	+3
8	+3
9	+4
10	+4
11	+4
12	+4
13	+5
14	+5
15	+5
16	+5
17	+6
18	+6
19	+6
20	+6
21	+7
22	+7
23	+7
24	+7
25	+8
26	+8
27	+8
28	+8
29	+9
30	+9