koths (King of the hill) should be added to op factions and factions :p. If you don't know what a koth is, it's when you and your faction try to capture an objective to win a prize, other factions fight to try gain control, however if the person who is capping it gets it out, the timer restarts and the 2nd person who got there starts to cap. The player who caps it in the time wins a reward. Koths usually happen randomly throughout the day on faction servers.
You have to capture an object and not get hit out for a time limit, while other factions fight to capture it. When won you usually get a decent reward.
