Characters may make called shots
against specific parts of their opponent's anatomy. This may be
useful to target weakly armored areas, such as attacking a
heavily-armored but helmetless opponent. Called melee shots
suffer a -4 to their attack roll, and trigger attacks of
opportunity. Called ranged shots suffer a -4 to their attack
rolls, and are full-round actions.
Specific situations may modify the above rules. For example, if
attacking an opponent from directly above, and making a called shot at
their head, melee attacks are at -2 and do not provoke AOOs.
Similar ranged attacks are at -2 and are standard (attack) actions.