This is a simple house rule to give simple answers to players that want to grapple, spit in the eye, kick in the groin, intimidate and such.
Make an attack using the appropiate Ability Score + Level vs. appropriate Defense (AC, PD or MD).
The condition lasts until the end of the target’s next turn.
Escaping from a Combat Maneuver
To escape from a combat maneuver you have to spend your move action and pass a hard save 16+.
Combat Maneuvers Feats
Adventurer: You can add any appropiate background to the roll.
Champion: The condition lasts for 1d4 rounds.
Epic: You can pick any condition.