User blog comment:B214/Question and Answers 2/@comment-75.93.25.66-20140216013014/@comment-9339850-20140216013522

Senjutsu and Touki affect life-force, so i dont think they affect the soul directly.

Side-note, Touki is used by Senjutsu users so its all one and the same essentially, though Sairaorg is the only one so far that can use Touki with out being a Senjutsu user due to his extreme physical training