A character can attempt an overrun as an attack action made during his or her move action, or as part of a charge. (In general, a character cannot make an attack action during a move action; this is an exception.) In either case, the character doesnít get a 5-foot step before, during, or after the overrun attempt. With an overrun, the character attempts to move through an opponents area, going past or over the opponent. A character can only overrun an opponent who is one size category larger than the character, the same size, or smaller. A character can make only one overrun attempt per action.
First, the character must move at least 10 feet in a straight line into the targetís square (provoking attacks of opportunity normally).
Then the target chooses either to avoid the character or to block the character. If the opponent avoids the character, the character keeps moving. (A character can always move through a square occupied by someone who lets the character by.) If the opponent blocks the character, make a trip attack against the opponent (see Trip). If the character succeeds in tripping his or her opponent, the character can continue his or her movement as normal.
If the character fails and are tripped in turn, the character falls prone in the targetís square. If the character fails but are not tripped, the character has to move 5 feet back the way he or she came, ending his or her movement there. If that square is occupied, the character falls prone in the square.