How do you get the Season Year 2025 - Grandmaster Icon?
It was a ranked reward. Riot's description in the client reads: “This icon was earned by achieving Grandmaster in Season Year 2025.”
Is the Season Year 2025 - Grandmaster Icon still available?
No. The Season Year 2025 - Grandmaster Icon was a ranked reward: to get it you had to reach Grandmaster during the 2025 season. Riot does not give out past ranked rewards again, so it cannot be earned anymore.
Season Year 2025 - Grandmaster Icon is one of the rarest LoL summoner icons.
