No one is entirely sure who invented this potion, but those without the knowledge were invariably the losers in warfare. In ancient times armies would be given doses of this potion before they were sent off to battle. It made them deadlier, faster and vastly increased their chances of victory.
The Children of Shadows used to try brew large quantities of this potion every time they went off on a mission, so that they would have the edge were they ever caught. Many a guard could attest to the power of this potion, but fortunately it didn’t make up for a general lack of melee skill.