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Ability modifier

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An ability modifier is the bonus or penalty associated with a particular ability score. Ability modifiers apply to die rolls for character actions involving the corresponding abilities -- such as attack rolls, saving throws and skills. The modifier is also used with some numbers that aren't die rolls. A positive modifier is called a bonus, and a negative modifier is called a penalty.

The modifier is equal to +1 for every 2 points above 10 in that ability score (or -1 for every 2 full points below 11). For example, constitution 14 provides +2 hit points per level.

In addition, ability scores determine the number of bonus spells for spellcasters. The ability that spells relate to depends on the type of spellcaster:

In addition to having a high ability score, a spellcaster must be of sufficient level in order to gain any bonus spells for a given level.
Spellcasters must also have a 10 or higher in the appropriate ability score in order to cast any spells.

Ability Modifier and Bonus SpellsEdit

Modifier TableEdit

Ability
Score
Modifier/
1.5x Modifier*
Bonus Spells (by Spell Level)
0 1 2 3 4 5 6 7 8 9
1 -5/-5 Can't cast spells tied to this ability
2-3 -4/-4 Can't cast spells tied to this ability
4-5 -3/-3 Can't cast spells tied to this ability
6-7 -2/-2 Can't cast spells tied to this ability
8-9 -1/-1 Can't cast spells tied to this ability
10-11 0/0 - - - - - - - - - -
12-13 +1/+1 - 1 - - - - - - - -
14-15 +2/+3 - 1 1 - - - - - - -
16-17 +3/+4 - 1 1 1 - - - - - -
18-19 +4/+6 - 1 1 1 1 - - - - -
20-21 +5/+7 - 2 1 1 1 1 - - - -
22-23 +6/+9 - 2 2 1 1 1 1 - - -
24-25 +7/+10 - 2 2 2 1 1 1 1 - -
26-27 +8/+12 - 2 2 2 2 1 1 1 1 -
28-29 +9/+13 - 3 2 2 2 2 1 1 1 1
30-31 +10/+15 - 3 3 2 2 2 2 1 1 1
32-33 +11/+16 - 3 3 3 2 2 2 2 1 1
34-35 +12/+18 - 3 3 3 3 2 2 2 2 1
36-37 +13/+19 - 4 3 3 3 3 2 2 2 2
38-39 +14/+21 - 4 4 3 3 3 3 2 2 2
40-41 +15/+22 - 4 4 4 3 3 3 3 2 2
42-43 +16/+24 - 4 4 4 4 3 3 3 3 2
44-45 +17/+25 - 5 4 4 4 4 3 3 3 3
46-47 +18/+27 - 5 5 4 4 4 4 3 3 3
48-49 +19/+28 - 5 5 5 4 4 4 4 3 3
50 +20/+30 - 5 5 5 5 4 4 4 4 3

* Usually the strength based damage modifier when wielding a weapon two-handed or the combined bonus when dual-wielding. See also Combat Insight.


FormulaEdit

bonus = (ability – (spellLevel + 1) * 2) / 8
  • Division is rounded down, to 0 minimum.
  • 0-level spells receive no bonuses.
  • If ability is less than 10+spellLevel, no spells of that level can be cast.
  • Ability should be 0 or greater.
  • SpellLevel should be between 1 and 9.


modifier = ability / 2 – 5
modifier = (ability – 10) / 2
  • Division is rounded down.
  • Ability should be 0 or greater.

See alsoEdit

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