Kraken Slayer 6672since 10.23.1 18 changes
3000g (400g base, 2100g sell)
Bring It Down: Every third Attack deals additional physical damage. Repeated triggers on the same target increase the damage dealt.
Builds from: 
Noonquiver
Cloak of Agility
Recurve Bow
Builds into: 
Swordnado
DamageCriticalStrikeAttackSpeed
Click any two patches to compare; the current range is shaded.
− Every third basic attack deals additional physical damage on-hit, increasing when hitting the same target repeatedly.
+ Every third basic attack deals additional physical damage on-hit, increased based on the target's missing health.
− Every third basic attack deals additional physical damage on-hit, increased based on the target's missing health.
+ Every third Attack deals bonus physical damage On-Hit, increased based on their missing Health.