Fnatic Karthus

The Fnatic Karthus is part of the World Champions: 2011 collection, a skin that pays tribute to the team’s title-winning season with its own in-game homage. Released in September 2014, it cost 750 RP, even though the championship it honors had already been won years earlier.

It has since been moved to the Legacy vault, so you won’t find it in the standard store anymore. It appears again only during Riot’s occasional legacy sales, which makes it something collectors have to keep an eye out for.