Once on your turn when you damage a hostile creature with a melee weapon, you gain one stage of Melee Momentum, to a maximum of 3 stages. If you reduce a hostile creature to 0 hit points with damage from a melee weapon, you may spend any amount of Melee Momentum stages you have, regaining 1d6 energy shield points per stage spent. You lose all stages of Melee Momentum if you become Incapacitated or complete at least a brief rest, whichever happens first.