I\'d like to see something that lets you sprint \"full tilt\", because \"run\" feels more like jogging.
Furthermore, this should also be available if your stamina is zero, so that you can get away from immediate danger. After all, you wouldn\'t, even if exhausted, just stand there watch the Grendol come to slay you, would you?
Make it drain stamina quickly, and if stamina gets zero, have it drain HP at a moderate rate. That way, it won\'t be prone to abuse while OTOH not forcing you to die because you saw the grendol too late and / or just didn\'t monitor the stamina all the time.