Combat Reflexes (Feat)
Stand Still (Feat), Steady Engagement (Feat), Strike Back (Feat), Vicious Stomp (Feat)
Benefit: You may make a number of additional attacks of opportunity per round equal to the number of attacks per round you can make with your current class, to a maximum of +4 bonus attacks of opportunity per round. Note that these bonus attacks of opportunity are in addition to the 1 attack of opportunity everyone gets each round.
Thus, a character with four attacks per round from their current class would get a total of 5 attacks of opportunity each round (4 from this feat, plus the 1 that all creatures get). If that character later multi-classed to a class that only gets two attacks per round, even though they retain all four attacks (albeit at diminished to-hit numbers), they only get two additional attacks of opportunity per round while they are advancing that class.
The Combat Reflexes feat does not allow a rogue to use their Opportunist ability more than once per round.
Special: With this feat, you may also make attacks of opportunity while Flat-Footed.
Normal: A character without this feat can make only one attack of opportunity per round and can't make attacks of opportunity while flat-footed.