Verified for patch 16.8.1

Silvermere Dawn

Grants immunity to Stuns and the holder's attacks Stun the target for 0.8 seconds.

The holder's Attack Speed is locked at 0.5.

Source

Artifact

Effects

AD: 1.4
Armor: 80
AttackSpeedCap: 0.5
MagicResist: 80
StunDuration: 0.8

Silvermere Dawn enables

Stun On the Menu

Disables the target for a duration: no movement, no attacks, no ability casts.

Silvermere Dawn scales with

Attack Speed On the Menu

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