Riot dev reveals plans to expand League's Champion Mastery system - Dexerto
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Surrender at 20: Red Post Collection: Champion Mastery Coming to live Soon
Should League of Legends offer better achievement perks for 1 Million Champion Mastery
ChampionMastery.GG - League of Legends champion mastery scores for Bonedoc27 (NA)
Champion Mastery - a statistical analysis of 1M+ games : r/leagueoflegends
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League of Legends' Champion Mastery system is live; go level up your champions
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Champion mastery system was added almost 2 yeats ago but stull looks unfinished. No additional progres, no additional cosmitics. Kinda the same with prismatics. System was added but never improved. : r/LegendsOfRuneterra
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