Verified for patch 16.8.1

Zeke's Bleak Herald

When combat begins, the holder reduces the Attack Speed of all allies within 1 hexes in the same row by 20%. The holder then gains 60% Attack Speed for each affected ally.

Source

Artifact

Effects

AD: 0.1
AttackSpeed: 60
AttackSpeedReduction: 20
Health: 150
HexRange: 1

Zeke's Bleak Herald scales with

Attack Speed On the Menu

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