General | Combat Stamina
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Demoralizing Lash (Combat)

Source Advanced Race Guide pg. 124
You cow your enemies with the lash of a whip.

Prerequisites: Base attack bonus +1, Intimidate 1 rank, hobgoblin.

Benefit: To use this feat, you must use a whip (or another weapon in the flails fighter weapon group) to attack a foe demoralized by an Intimidate check. If the attack hits, you extend the duration the creature is shaken by 1 round. This feat has no effect on creatures whose shaken conditions are from sources other than Intimidate checks.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 117
When you hit a demoralized foe with a weapon in the flails fighter group, you can spend 2 stamina points to extend the duration of the shaken condition by 1d4 rounds instead of 1 round.