First Strike

Attacks or abilities against an enemy champion within 0.25s of entering champion combat grant 10 gold and First Strike for 3 seconds, causing you to deal 7% extra damage against champions, and granting 50% (35% for ranged champions) of bonus damage dealt as gold. Cooldown: 25 - 15s

Tree

Inspiration

Row

Keystone

In short

When you initiate champion combat, deal 7% extra damage for 3 seconds and gain gold based on damage dealt.

Patch

16.16.1