5.92M accounts from Nexus Mods (nexusmods.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 2015, the game modding site Nexus Mods released a statement notifying users that they had been hacked. They subsequently dated the hack as having occurred in July 2013 although there is evidence to suggest the data was being traded months in advance of that. The breach contained usernames, email addresses and passwords stored as a salted hashes.
Source: Have I Been Pwned (CC BY 4.0)