Not seen a mention of this anywhere else either - bear in mind the power sources add extra procs of varying types:
![Image](http://i16.tinypic.com/4ftpt3n.png)
![Image](http://i12.tinypic.com/2ms12fa.png)
I suspect there might be a higher tier available with ally faction (along with a shield or two), but I've yet to get that far! The vendor is Trader Hyalunes in Katta's market square.