Boost

 The Boost , is a temporary superpower, the genetic heritage of the Deathstalker line, a chemical reaction in the body that enhances all of the senses, as well as strength and speed, for a short time. However, the candle that burns twice as bright lasts half as long, and the Boost takes a physical toll on the body that the user must pay for after the Boost is over.

The ability was in development but not working during the natural lifetime of Giles Deathstalker.