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Alignment reflects how your character relates to the concepts of good and evil, law and chaos. It can affect how certain NPCs react within the game, and will occasionally determine whether an item can be used or not (some items have alignments of their own, and will not allow a conflict with their user). The main purpose of alignment, however, is to act as a guideline for consistent roleplaying, though it is not set in stone. The alignment of a character can change to match the style in which they are played, if deviation is consistent and serious. All of the nine alignments listed are viable choices for adventurers, though the "evil" variants are more often the domain of villains and monsters.

The alignment of a PC is a tool for developing its personality. It is more guideline than restriction. Each alignment represents a broad range of personality types and personal philosophies, so two characters of the same alignment can still be quite different from each other. In addition, occasional deviations are permissible, as few people are completely consistent in their behavior.

Actions taken while playing may alter alignment. The details depend on the module (for example, the original campaign provides no ways to shift along the law/chaos alignment axis), although the default scripts do call for a 5-point shift towards evil for killing a non-evil creature of the commoner class (generally, townfolk). This is of particular concern to those playing one of the alignment-restricted classes, such as paladin, druid, monk, barbarian, bard, and several prestige classes.

The nine alignments

Alignment has two dimensions, each with three categories. The moral dimension reflects how a character relates to good and evil, consisting of the categories "good", "neutral", and "evil". The ethical dimension reflects how a character relates to law and chaos, consisting of the categories "lawful", "neutral", and "chaotic". Combining these dimensions yields the nine alignments.

lawful
70-100
neutral
31-69
chaotic
0-30
good
70-100
lawful good neutral good chaotic good
neutral
31-69
lawful neutral true neutral chaotic neutral
evil
0-30
lawful evil neutral evil chaotic evil

Characters with an alignment that is partially neutral are generally more dedicated to the non-neutral aspect of their alignment; those with a "corner alignment" often face dilemmas in which their moral and ethical stances are at odds with each other. For example, if a character is ordered to kill an innocent, the lawful neutral response is to obey, the neutral good is to refuse, and the lawful good is to evaluate which has priority in the situation: law or good?

Changing alignment

Every character has a rating, from 0 to 100, in each of the two dimensions of alignment. The ratings that correspond to each category are indicated in the above table. Actions that affect alignment cause these ratings to shift by a specific amount. When one of the ratings crosses a boundary into a new category, two things happen. First, the character's alignment changes to the new category. Second, the rating in question is set to the middle of the new category's range. For example, if a lawful evil character with a moral rating of 30 receives a 1 point shift towards good, the character's alignment will change to lawful-neutral and the character's moral rating will become 50.

Alignment titles

PCs who manage to reach "purity" within their alignment are rewarded with an alignment title. For this purpose, "purity" means ratings of 0, 50, or 100 in each dimension, as indicated in the table below. (Ratings are listed for the law-chaos axis, then the good-evil axis.)

lawful neutral chaotic 
good Crusader
(100,100)
Benefactor
(50,100)
Rebel
(0,100)
neutral  Judge
(100,50)
Reconciler
(50,50)
Free Spirit
(0,50)
evil Dominator 
(100,0)
Malefactor
(50,0)
Destroyer
(0,0)

Since PCs begin in the middle of their alignment's rating range, only the true neutral alignment title is obtainable without an alignment shift. On the other hand, the true neutral alignment title is the hardest to maintain, as any alignment shift will strip the title from the PC. (For comparison, a shift towards good will not strip a neutral good PC's alignment title since the good rating cannot go above 100.)

Alignment titles are mere honorifics; they are listed on the character sheet but have no effect on gameplay.

The moral dimension

The moral dimension of alignment reflects a character's position with respect to pre-defined, absolute concepts of "good" and "evil".

The ethical dimension

The ethical dimension of alignment reflects a character's position with respect to pre-defined concepts of "law" and "chaos". These concepts tend to be different from what most people would infer from their names.