Time breaker form is used mainly by Kenji Lescara to dramatically increase speed. When it's activated the user's defense is decreased by about a quarter for a dramatic increase speed. This form does not require any energy for usage, in fact it slowly regenerates any damage while in the Timebreaker Form. Timebreaker Form has different stages and types The Etherial version and the Nightbreaker Form.
book: "Timebreaker form can be taught to others with similar blood ties but requires immense training to perfect."