League of Legends Reforged Rune: First Strike

Dealing damage to an enemy champion within the first 0.25 seconds of champion combat, grants 5 gold and First Strike for 3 seconds, causing all of your damage dealt against champions to deal 9% bonus damage. Afterwards, you are granted (100% for Melee / 70% for Ranged) of all bonus damage dealt within the duration as gold.

First Strike will be placed on cooldown after being struck by an enemy champion before you strike them.

Cooldown: 25−15 seconds (depending on level)