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| Bonus Type | Improves |
| Armor | AC |
| Circumstance | Attacks, checks |
| Competence | Attacks, saves, checks |
| Deflection | AC |
| Dodge | AC |
| Enhancement | Armor's bonus |
| Enhancement | Attacks, damage |
| Enhancement | Ability scores |
| Enlargement | Str, Con |
| Haste | AC |
| Inherent | Ability scores |
| Insight | Attacks, AC, saves, checks |
| Luck | Attacks, weapon damage, AC, saves, checks |
| Morale | Attacks, weapon damage, checks, saves |
| Natural armor | AC |
| Profane | AC, saves, checks |
| Resistance | Saves |
| Sacred | AC, saves, checks |
| Synergy | Checks |
Many magic items offer a bonus on attack rolls, damage rolls, saving throws, Armor Class, ability scores, or skill checks. Most items that add to saving throws, attack rolls, damage rolls, or AC are restricted to a maximum bonus of +5. (Bracers of armor are an exception.) Most items that add to ability scores are restricted to a maximum bonus of +6, and the bonus usually comes in multiples of 2 (+2, +4, or +6). Skill check bonuses do not have a maximum.