Minbari Shadowsouled?

I see a prc for it in the Minbari book, and I seem to remember a small write up in the book about them but I can't find it. Can anyone point out a page number perhaps, because I keep looking and am coming up blank. Thanks!
THANK YOU. Shesh I had been lost for two days flipping back and forth a few times through the book, and I am well known for walking down the isle a few times at the store and not seeing something with a huge light attached lol.