How do you get the Tiny Tibbers! Icon?
It was released during a limited-time event. Riot's description in the client reads: “Released during Pandemonium: Act 1.”
Is the Tiny Tibbers! Icon still available?
Maybe, while it lasts. Riot tied the Tiny Tibbers! Icon to 2026 (limited-time event). It does not normally bring back event rewards or bundles once they end.
