How do you get the Corrupted Sapling Icon?
It was released during a limited-time event. Riot's description in the client reads: “Released during For Demacia: Act II.”
Is the Corrupted Sapling Icon still available?
Maybe, while it lasts. Riot tied the Corrupted Sapling Icon to 2026 (limited-time event). It does not normally bring back event rewards or bundles once they end.
