Well...I guess the best way to put it is I suck out a portion of 'energy' every time I make contact. And if I drain enough, as I found out in training, I can actually use that energy in an attack. It does some pretty significant damage! If the Kishin is worn down enough, I can pull the soul right out.

{There were probably other attacks she could use, but since Kanji gained an official partner she hadn't had anybody to explore that with.}