Proficient

From DDO wiki

Being proficient with a weapon, shield or armor means you can use it without incurring the non-proficiency penalties. Proficiencies are obtained through feats, either given at character creation or during advancement.

If a character is not proficient with a weapon or shield, the icon of that item will have a yellow border and an exclamation mark will be displayed on top of the icon as well.

[edit] Proficiency feats

Every class gives your character proficiencies in weapon and armor usage. Weapon proficiencies are split into simple, martial, and exotic. Armor is divided into light armor, medium armor, heavy armor, and shields. If you do not have the correct proficiency then you suffer a non-proficiency penalty when using the item.

• Simple Weapon Proficiency
• Martial Weapon Proficiency (per weapon)
• Exotic Weapon Proficiency (per weapon, requires base attack bonus of +1 or higher)
• Light Armor Proficiency (all)
• Medium Armor Proficiency (all, requires Light Armor Proficiency)
• Heavy Armor Proficiency (all, requires Medium Armor Proficiency)
• General Shield Proficiency (all except Tower shields)
• Tower Shield Proficiency (requires General Shield Proficiency)

[edit] Non-proficiency penalties

• Gives -4 to attack rolls if not proficient with weapon.
• Applies item's Armor Check Penalty to attack rolls if not proficient with armor or shield. (ACPs apply to skills regardless of proficiency.)
  • Note that an armor or shield with an ACP of 0 can be used without penalty by all characters whether they're proficient with it or not.
    • Mithral/darkwood heavy shield has 0 ACP.
    • Mithral light shield has 0 ACP and 0% ASF.