From Pathfinder Lost Omens Cheliax, Infernal Inheritance, which isn't enabled.

Reckless Riding Lunge

FEAT 4

Activity 1 action

Prerequisites Cavalier Dedication; trained in Acrobatics

Requirements You're mounted and wielding a melee weapon.

You leap up to stand on your mount and dig your heels in for stability, allowing you to lean horizontally to attack while remaining mounted. Until the end of your current turn, your reach with melee weapons increases by 5 feet.

Pathfinder Lost Omens Cheliax, Infernal InheritanceORC