How do you get the Worlds 2015 Fnatic Champion Icon?
It was a mission or event reward. Riot's description in the client reads: “This icon was granted to players who owned the 2015 Fnatic icon if Fnatic won on 10/31.”
Is the Worlds 2015 Fnatic Champion Icon still available?
No. Riot tied the Worlds 2015 Fnatic Champion Icon to 2015 (mission reward), and it does not normally bring back past event rewards or bundles.
