[Rendar]

If you plan to spend 3 Momentum to steal 21 FP from your target. You might just live a sad existence.

A possible solution to this is having the ability to toggle it and you get a buffer of 50% of your FP taken away from you for the fight. This FP doesn't regen, but it acts like a shield for your health. Still allowing you the ability to fight, and you can toggle it on/off. Seems easy-enough a fix if no one can attack that reserve with Null Shell/Vamp shell.