Birkelstein
About lowering power... It means exactly what it says - you have to lower opponents' power using for example:
A. Any character equipped with set of Energy Talismans...
B. Eddie The Cyborg and so his fury...
C. Assasin Corrupt Rescuer's power move...
There MAY BE some other ways of course for sure... Though above three been tested by myself after each use and have increased the progress bar, so they have been working
Cheers,
W