"League of Legends" developer Riot Games have issued a statement to the North American community, detailing what information has been compromised by the hackers. To Riots' knowledge, usernames, email addresses, "salted password hashes," and real names were illegally accessed. Although password files are unreadable, users with predictable passwords are at high risk. Hashed and salted credit card numbers from approximately 120,000 transactions made in 2011 were also accessed, but Riot states the payment system hasn't been used since July of that year. However, they are "taking appropriate action to notify and safeguard affected players."
Hacked "League of Legends" players will be notified by Riot via email, but for now, it's recommended that the community change their passwords "to stronger ones that are much harder to guess." Websites like PC Mag have written articles on how users can strengthen their passwords to avoid their accounts from being easily compromised.