| Constant | Description |
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| SKILL_ALL_SKILLS | |
| SKILL_ANIMAL_EMPATHY | | Improves the attitude of an animal. Can be used on normal animals with no penalty, and with penalty on beasts and magical beasts. |
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| SKILL_CONCENTRATION | | Permits the casting of a spell despite distractions, such as taking damage, getting hit by an unfriendly spell, and so on. |
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| SKILL_DISABLE_TRAP | | Disarm a located trap (see Disarm Device skill in 3rd Edition Player's Handbook). |
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| SKILL_DISCIPLINE | |
| SKILL_HEAL | | Used for applying Healer's Kit items for healing. |
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| SKILL_HIDE | | Opposed by an opponent's Spot skill for remaining visibly undetected. |
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| SKILL_LISTEN | | Opposed by an opponent's Move Silently skill to locate stealthy foes. |
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| SKILL_LORE | | Ability to identify magical items and their properties without the aid of an Identify spell. |
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| SKILL_MOVE_SILENTLY | | Opposed by an opponent's Listen skill for remaining audibly undetected. |
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| SKILL_OPEN_LOCK | | Used for opening locks on doors and chests. |
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| SKILL_PARRY | | Used to increase armor class against attacks. |
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| SKILL_PERFORM | |
| SKILL_PERSUADE | | Used for convincing an NPC to be more reasonable by sharing information, giving the PC a discount on a price of an item, etc. |
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| SKILL_PICK_POCKET | |
| SKILL_SEARCH | | Used for discovering hidden treasures, or secret doors in an area. SUBSKILL_FLAGTRAP is used by a Rogue when searching for traps. |
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| SKILL_SET_TRAP | |
| SKILL_SPELLCRAFT | | Used for identifying spells and spell-like effects. |
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| SKILL_SPOT | | Opposed by an opponent's Hide skill to locate stealthy foes. |
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| SKILL_TAUNT | | Used to distract an opponent from attacking another member of your party. |
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| SKILL_USE_MAGIC_DEVICE | | Allows a PC to "fake" a requirement for a magical item (i.e. cast a spell from an arcane spell if the PC is a Rogue only). |
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