Editing Ogre:CharacterCodex:Introduction (section)

===Modifiers===

====Favorable and Unfavorable Conditions====
Some situations may make a skill easier or harder to use, resulting in a bonus or penalty to the skill. A modifier can affect your skill roll or the DC of the task to be done. Modifiers are always describe in four parts, for example, a +2 insight bonus to Spot check. 

* The first part (+2) is the value you add or subtract from a skill check or a DC.
* The second part (insight) is the type of modifier that you receive. As a general rules, modifier of the same type do not stack, you take only the best bonus or the worse penalty.
* The third part (bonus) explains if the modifier is advantageous for the player or not. A bonus is always advantageous for a character while a penalty always hinders the character. 
:''For example a +2 circumstance penalty to Climb DC makes the DC of a check higher and more difficult to do.''
* The last part (Spot check) gives the skill that the modifier affect and if it is applied to the skill check or to the skill DC.

====Skill Modifier vs. DC modifier====
Both modifiers influence your chance of success when using a skill, but there is one important difference between a modifier to a check and to a DC. The DC modifier only affects your chance of success, while a skill modifier also changes your chance of doing a Total Failure. For example, with a -4 penalty to a check, you have more chance of having a check that fall below 0 while a +4 penalty to DC do not increase the probability of having a check below 0. While DC penalty make an action harder to make, a skill modifier also make the action more risky. When giving modifiers, the Gamemaster should always think if the action is only more difficult (DC modifier) or if it is also more dangerous (Skill modifier).

====Modifier Types====
Here is a list of the different modifier your character can have.
=====Ability Modifier=====
The bonus or penalty associated with a particular ability score. Ability modifiers apply to die rolls for character actions involving the corresponding abilities. 
=====Circumstance Modifier=====
A circumstance bonus (or penalty) arises from specific conditional factors impacting the success of the task at hand. Circumstance bonuses stack with all other bonuses, including other circumstance bonuses, unless they arise from essentially the same source. 
=====Deflection Bonus=====
A deflection bonus affects Defense Resistance and is granted by an effect that makes attacks veer off harmlessly. Deflection bonuses stack with all other bonuses to Defense except other deflection bonuses.
=====Dodge Bonus=====
A dodge bonus improves Defense Resistance resulting from physical skill at avoiding blows and other ill effects. Any situation or effect (except wearing armor) that negates a character's Dexterity bonus also negates any dodge bonuses the character may have. Dodge bonuses stack with all other bonuses to Defense, even other dodge bonuses.
=====Enhancement Bonus=====
An enhancement bonus represents an increase in the sturdiness and/or effectiveness of armor or natural armor, or the effectiveness of a weapon, or a general bonus to an ability score. Multiple enhancement bonuses on the same object (in the case of armor and weapons), creature (in the case of natural armor), or ability score do not stack. Only the highest enhancement bonus applies. 
=====Insight Bonus=====
An insight bonus improves performance of a given activity by granting the character an almost precognitive knowledge of what might occur. Multiple insight bonuses on the same character or object do not stack. Only the highest insight bonus applies. 
=====Luck Modifier=====
A luck modifier represents good (or bad) fortune. Multiple luck bonuses on the same character or object do not stack. Only the highest luck bonus applies. 
=====Morale Modifier=====
A morale bonus represents the effects of greater hope, courage, and determination (or hopelessness, cowardice, and despair in the case of a morale penalty). Multiple morale bonuses on the same character do not stack. Only the highest morale bonus applies. Non-intelligent creatures (creatures with an Intelligence of 0 or no Intelligence at all) cannot benefit from morale bonuses. 
=====Pain Penalty=====
Some wounds are so painful that you cannot act without causing yourself more pains resulting in a penalty to all actions. Pain penalty from different wounds does not stack, but pain penalty provided by a single attack does stack.
=====Profane Modifier=====
A profane bonus (or penalty) stems from the power of evil. Multiple profane bonuses on the same character or object do not stack. Only the highest profane bonus applies. 
=====Racial Modifier=====
Races have different capabilities resulting in modifiers from most attributes. 
=====Sacred Modifier=====
A sacred bonus (or penalty) stems from the power of good. Multiple sacred bonuses on the same character or object do not stack. Only the highest sacred bonus applies. 
=====Size Modifier=====
A size bonus or penalty is derived from a creature's size category.