Despite their best efforts to avoid bloodshed, sometimes investigators are faced with situations where the outcome can only be decided by the fist or gun. In combat investigators clash headlong with agents of the Cthulhu Mythos, monsters and other foul denizens of the night.

Combat encompasses a range of skills and goals; sometimes an investigator may wish to merely subdue an opponent without causing undue harm, whilst at other times the goal may be to kill, or simply to flee.

Combat has its own rules that focus on the action and help to determine who is doing what, when it is done, and the degree of success achieved. Rather than having a single roll decide the outcome of the fight, a series of rolls are made until there is a clear victor.