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
League of Legends Champion Mastery Level 6 and 7 Emotes — A How-To Guide - YouTube
League of Legends Champion Mastery 7 Symbol Rank Magnet for - Etsy
Free Champion Card with the new Card Mastery feature! : r/ClashRoyale
League of Legends' Champion Mastery system is live; go level up your champions | PCGamesN
dev: Balancing New Champions - League of Legends
The Complete League of Legends Mastery Overview | GooseSmurfs