How do you get the Bee Singed Icon?
It was sold in the League of Legends store. Riot's description in the client reads: “This icon was released in the store for purchase during 2017.”
Is the Bee Singed Icon still available?
Probably not. Riot tied the Bee Singed Icon to 2017 (store purchase), and it does not normally bring back past event rewards or bundles.
