User blog comment:Omega natsu2/Fairy Tail Episode 197: Hisui Rises, Review./@comment-77.194.131.178-20141108095546/@comment-7418318-20141108115850

At this point we barely know anything about some of Lucy's gold Spirits (like Capricorn), so I doubt we'll be getting in-depth information about any silver keys for the time being (or at all).