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Charging is a special full-round action that allows you to move up to twice your speed and attack during the action. However, it carries tight restrictions on how you can move.
Movement During a Charge
You must move before your attack, not after. You must move at least 10 feet (2 squares) and may move up to double your speed directly toward the designated opponent.
You must have a clear path toward the opponent, and nothing can hinder your movement (such as difficult terrain or obstacles). Here’s what it means to have a clear path. First, you must move to the closest space from which you can attack the opponent. (If this space is occupied or otherwise blocked, you can’t charge.) Second, if any line from your starting space to the ending space passes through a square that blocks movement, slows movement, or contains a creature (even an ally), you can’t charge. (Helpless creatures don’t stop a charge.)
If you don’t have line of sight to the opponent at the start of your turn, you can’t charge that opponent.
If you are able to take only a standard action or a move action on your turn, you can still charge, but you are only allowed to move up to your speed (instead of up to double your speed). You can’t use this option unless you are restricted to taking only a standard action or move action on your turn.
Attacking on a Charge
A charging character gets a +2 bonus on the Strength check made to bull rush an opponent (see Bull Rush, above).
Even if you have extra attacks, such as from having a high enough base attack bonus or from using multiple weapons, you only get to make one attack during a charge.
Lances and Charge Attacks
A lance deals double damage if employed by a mounted character in a charge.
Weapons Readied against a Charge
Spears, tridents, and certain other piercing weapons deal double damage when readied (set) and used against a charging character.