5.19M accounts from Stronghold Kingdoms (strongholdkingdoms.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 July 2018, the massive multiplayer online game Stronghold Kingdoms suffered a data breach. Almost 5.2 million accounts were impacted by the incident which exposed emails addresses, usernames and passwords stored as salted SHA-1 hashes.
Source: Have I Been Pwned (CC BY 4.0)