Syntax: (un)briefmon <monster>, (un)briefmon all
This will make it so the only the monster's combat messages shown are hits, misses will not be shown, and if you have ANSI, hits will have color based on damage. This command is very useful. Here's an example:
This is a round of fighting without briefmon:
Guard missed Silvercharm. Guard smashes your right arm with a bone crushing sound. Guard missed Silvercharm. Guard hits your left fist hard. Guard hits your right fist.
This is a round of fighting with briefmon:
Guard hits Silvercharm Guard hits Silvercharm Guard hits Silvercharm
Obviously, this cuts down on spam, and allows you to get a better idea of how many hits you take in a round.