Force Rage, also known as Dark Rage, Force Enrage, or Force Fury, is a dark side force power. The Force-user would tap into his/her innermost fears, pain and hate, and convert them into an intense rage. The user could then channel the anger to increase his/her own speed, strength and ferocity. However, the body could not handle such rage for long periods of time, so the user became greatly weakened for some time after the rage subsided.
If light side Force-users wielded Force rage, it could permanently disrupt their connection to the light side of the force unless something happened to interrupt the rage and bring them out of the dark side's grip. Therefore, the rage could give the wielder an instantaneous physical and mental response, but pull them into deep depression, physiological harm and the endless void of the dark side. Very few Jedi are capable of using and mastering Force rage without falling to the dark side.