8.09M accounts from Heroes of Newerth (heroesofnewerth.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswordsUsernames
In December 2012, the multiplayer online battle arena game known as Heroes of Newerth was hacked and over 8 million accounts extracted from the system. The compromised data included usernames, email addresses and passwords.
Source: Have I Been Pwned (CC BY 4.0)