This weapon is balanced to flow from one strike to the next. When you attack a creature different from the last creature you attacked this turn with this weapon, the Repeated Attack Penalty (RAP) for that attack is reduced by the listed amount.
Example
Momentum (1): Reduces RAP by 1 (e.g., –5 becomes –4).
Momentum (2): Reduces RAP by 2 (e.g., –5 becomes –3).