Potion of Great Speed

This potion rushes about its bottle, sloshing from top to bottom and side to side, as if unable to stay in one place for too long. Effectively doubling the speed of the imbiber reactions become quicker and distances can be covered in astonishing speed. In a combat situation the imbiber gains a second move action, as well as a bonus to attack rolls and physical defence (dependant on tier). Outside of combat the movement speed of the character is doubled - likely allowing them to outrun most normal foes. The effect lasts for a single battle, or 5 minutes, regardless. 

There is a downside to drinking such a potent mixture, however - each use ages you by a single year.