pf2e.fyi
From Pathfinder Lost Omens Shining Kingdoms, which isn't enabled.

Slowing Strike

FEAT 12
ARCHETYPE
Activity free action
Archetype Lion Blade
Prerequisites Lion Blade Dedication
Frequency once per round
Trigger Your Strike hits an Off-Guard creature and deals damage.

You wound your enemy so they can't move nimbly. The target must attempt a Fortitude save against your class DC or spell DC, whichever is higher.

Critical Success The creature is unaffected.

Success The creature takes a –10-foot status penalty to its Speeds until the beginning of your next turn.

Failure As success, but the penalty lasts for 1 minute.

Pathfinder Lost Omens Shining KingdomsORC