Increases the amount of rage generated by your Charge ability by 3.
"In the furious cacaphony of combat, it is the strong and the weak. The warrior must learn to use his full strength and power when it comes to the initial rush, to conserve one's fury and unleash it on the unfortunate."
Improved Charge increases the rage gained when using the Charge ability.
The extra rage makes it useful as it allows you to begin using your skills earlier after entering combat.