Verified for patch 16.8.1

Hellfire Hatchet

Attacks deal 3% of the holder's max Health as bonus physical damage. For every 1% missing Health, gain 1% Attack Speed.

Source

Artifact

Effects

AD: 0.2
ASPerMissingHealthPercent: 0.01
Health: 150
MaxHealthPercentDamage: 0.03
MissingHealthPercent: 0.01
StatOmnivamp: 0.2

Hellfire Hatchet scales with

Attack Speed On the Menu

Scales with bonus Attack Speed; a payoff axis for AS-stacking carries.