Board Thread:Questions and Answers/@comment-11118458-20131103160549/@comment-8986886-20131103222432

I can't find any mention of Reiryoku in the first chapter either. In the translation I have, Rukia only mentions "strong spirit activity" and "high spiritual concentration". In chapter eight Rukia explains Reiraku as "the ability to visualize the spirit's aura", but she doesn't mention Reiryoku.

It's probably mentioned in one of the early chapters, but I'm too lazy to read through 20 or 30 chapters just for that. Could Uryu have explained the concept of Reiryoku to Ichigo, when he challenged him to exterminate Hollows? How about whoever finds a source that mentions Reiryoku, is awarded the title "Investigator of the Week"? :)