The Way of the Closed Fist is an essence gem which grants a large bonus to Intimidation and a moderate bonus to Body, while imposing a moderate penalty to Spirit. As its name suggests, it is exclusive to followers of the Way of the Closed Fist. There is no Way of the Open Palm equivalent, with the gem called Way of the Open Palm affecting Intuition instead.
In-game description: "The Way of the Closed Fist is the way of violence and personal power. Take the world in your grasp and make it yours. A closed fist will beat down the walls of ignorance and lead to enlightenment, even if the Heavens themselves must shake from the force of it."