You must own the champion in order to earn it's mastery chest." in ARAM. : r/leagueoflegends
NERFPLZ.LOL What Is the New Champion Mastery System? | NERFPLZ.LOL
A Comprehensive Guide to Champion Mastery in League of Legends - Get S+ in Every Game! | Dignitas
Apparently if you own a free week champion you still can't obtain mastery chests in ARAM : r/leagueoflegends
Ultimate Guide to Champion Masteries | RiftFeed
Champion Mastery | League of Legends Wiki | Fandom
LoL Champion Mastery Boosting Services | Boosting Market
Champion Mastery | League of Legends Wiki | Fandom
Champion Mastery | League of Legends Wiki | Fandom
The Complete League of Legends Mastery Overview | GooseSmurfs
Hextech Crafting FAQ – League of Legends Support
Hextech Crafting FAQ – League of Legends Support
LoL Mastery and Chest - Apps on Google Play
Champion Mastery | League of Legends Wiki | Fandom
LoL Mastery and Chest - Apps on Google Play
Champion Mastery | League of Legends Wiki | Fandom
Champion Mastery | League of Legends Wiki | Fandom
League of Legends Champions Mastery Chart: What Is It? How to Create One?
Champion Mastery | League of Legends Wiki | Fandom
How to Check if You Got a Chest on a Champion in League of Legends - GameRiv
LOL: 20x Hextech Chest Opennings + Unlock Rank Mastery 7 - YouTube
Champion Mastery | League of Legends Wiki | Fandom
LoL Mastery and Chest - Apps on Google Play
Champion Mastery | League of Legends Wiki | Fandom
