pf2e.fyi
From Pathfinder Lost Omens Knights of Lastwall, which isn't enabled.

Staggering Fire

FEAT 6
Activity 1 action
Archetype Archer
Prerequisites Archer Dedication

You've learned how to fire at enemies to slow them down, allowing innocents and fellow knights alike time to escape. Make a ranged Strike with a weapon in the bow or crossbow weapon group. On a hit, the target takes a –5-foot circumstance penalty to its Speed until the end of its turn, or a –10-foot circumstance penalty on a critical hit.

Effect: Staggering Fire

Pathfinder Lost Omens Knights of LastwallOGL