Skull Crusher adds new features to the action of crushing another players skull. When you crush a players skull, a message will be printed in chat showing that the player has crushed the other players skull. This was intended to give players an extra way of showing that they dominated the other player.
Currently every player that crushes a skull is logged in the data file, so you can keep track of how many they have crushed. Future support for some kind of rewards / point system can...