1.54M accounts from Nival (nival.com) were exposed in this breach. Besides email addresses, it included avatars, dates of birth and genders.
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AvatarsDates of birthEmail addressesGendersNamesSpoken languagesUsernamesWebsite activity
In February 2016, the Russian gaming company Nival was the target of an attack which was consequently detailed on Reddit. Allegedly protesting "the foreign policy of Russia in regards to Ukraine", Nival was one of several Russian sites in the breach and impacted over 1.5M accounts including sensitive personal information.
Source: Have I Been Pwned (CC BY 4.0)