Image: Sucker Punch Productions / PlayStationOfficial screenshot from Sucker Punch Productions / PlayStation.
Haunting Precision is a combat trophy for 20 kills in Ghost Stance. The stance unlocks in The Ghost of Yarikawa, and you fill it by fighting well.
Kill seven enemies without taking a hit, or assassinate a Mongol leader, to fill the Ghost Stance meter. Press L3 and R3 to enter the stance, then cut down nearby enemies.
Assassinating a leader fills the meter at once. Environmental damage does not reset your counter.