The character has mastered the fickle flail, and wields it to deadly and terrifying effect on the field.
When wielding a flail or great flail, the character can spend either an Action Point or a Stamina Point to build up Momentum as they begin spinning the flail. Maintaining momentum is a Free Action. For attacks made with momentum, the character rolls an additional d4 (flail) or d6 (great flail) for damage. Momentum is lost when the character takes an Action other than attacking with the flail or dashing, when an attack with momentum is blocked, or at any other time the GM deems appropriate. Additionally, flails wielded by the character gain the Concussive quality.